Corset Fitting Guide: How to Choose, Size and Wear a Corset
A beautifully fitted corset can transform the line of an outfit, but choosing your first one can feel rather more complicated than buying other lingerie. Waist size is only part of the story: your torso length, rib and hip measurements, and the silhouette you want to create all help determine the right fit.
I’m Katie, founder and designer of What Katie Did. I first discovered corsets while working at Skin Two Clothing in 1995 and developed our first corset collection in 2004. Here, I’ve brought together my experience of designing and wearing corsets to help you choose yours with confidence—from measuring and selecting a style to lacing, checking the fit and wearing it beneath your favourite clothes.
Whether you’re buying your first corset or refining your fit, this guide will take you through each step. And if you need a little personal guidance, our team is here to help.
Choosing your corset
Start by thinking about how you want to wear your corset. Are you looking for a defined waist beneath a fitted dress, a foundation for your vintage wardrobe, or a corset to wear on show? Your choice should suit both your proportions and the clothes you plan to wear with it.
Underbust or overbust?
An underbust corset sits below the bust, allowing you to wear your own bra. This gives you flexibility over the neckline and bust shape you create, making it a versatile starting point for a vintage lingerie wardrobe.
An overbust corset covers and supports the bust as well as shaping the waist. Bust fit becomes an additional consideration, alongside your waist, rib and hip measurements and torso length.
Traditional corset, Demi Corset or waist cincher?
A traditional non-stretch corset uses a structured shape, boning and adjustable lacing to define the waist. Its proportions matter just as much as its waist size: there needs to be enough room for your ribs and hips.
Our Demi Corset combines a traditional corset busk and boning with stretchy powermesh and an elastic waist tape. It offers a different balance of shaping and flexibility. Follow its own sizing advice when choosing your size.
A stretch waist cincher or waspie offers more flexible shaping and can be a useful foundation beneath vintage clothing. The word “waspie” can also describe a short corset, so check the construction rather than choosing by the name alone.
Choosing the right length and shape
A longer corset gives more coverage over the lower tummy, but it also needs to suit your torso length when you sit down. A shorter style gives less coverage and may allow more freedom of movement.
Look at the proportions around the ribs and hips as well as the waist. Two corsets with the same labelled waist size can fit very differently, which is why taking your measurements is the next step.
How to measure for a corset
Accurate measurements are essential for choosing a corset. You’ll need a tape measure to check your waist, ribs, hips and torso length, then compare these with the sizing information for your chosen style.
Measure over bare skin or thin, close-fitting clothing. Keep the tape level when measuring around your body and measure very firmly. Record your measurements in inches so you can compare them with our corset sizing information.
Your natural waist
Measure very firmly around your natural waist, between your lowest ribs and the top of your hip bones. This should be narrowest part of your torso. If you’re unsure where to measure, bending gently to one side can help you find the crease.
Write down this measurement without subtracting anything. We’ll explain how to use it to choose your corset size in the next section.
Your ribs and hips
Measure around your ribcage where the top edge of your chosen underbust corset will sit.
For your hips, measure around your body where the bottom edge of the corset will sit. This may be your upper hip rather than the fullest part of your hips. Use the corset’s length and sizing information to help you compare the same points on your body and the garment.
Your torso length
Check the length listed for your chosen corset against your body, noting where its top and bottom edges would sit. Then sit upright on a firm chair and check that there is room for that length between your bust and thighs.
A corset needs to suit your proportions when you sit down as well as when you stand. More coverage is only useful if the length works for you.
Need help measuring?
If you’re unsure where to measure, contact us before ordering. Tell us which corset you’re considering, and we can help you check the measurements you need.
Finding your corset size
Our traditional non-stretch corsets are sized by their waist measurement when fully closed. A size 24-inch corset, for example, measures 24 inches around the waist when the back edges meet. This is the garment’s measurement, rather than the natural waist measurement of the person wearing it.
Start with your chosen style’s sizing guide
Take the firm waist measurement you recorded and follow the sizing recommendation for the corset you’re considering. The recommended reduction depends on the style and your individual proportions, so always check its product page before choosing.
Your waist measurement is the starting point. You also need to compare your ribs, hips and torso length with the corset’s measurements. Choosing a smaller waist size won’t create a better fit if the rest of the garment is too small for you.
Allowing for the lacing gap
You don’t need to close your corset completely at the back. We generally aim for an even gap of around 2 inches once the corset has been worn in, although the ideal gap will depend on the fit.
Our listed waist, rib and hip measurements describe the corset fully closed. An even 2-inch lacing gap adds approximately 2 inches to each of those circumferences when worn. For example, a corset measuring 30 inches around the ribs when closed will allow approximately 32 inches with that gap.
Keep this allowance in mind when comparing the garment’s dimensions with your measurements. The labelled waist size alone doesn’t tell you how the corset will fit when laced on your body.
Between sizes or unsure?
Your proportions and how firmly your body compresses both affect the fit. If your measurements suggest different sizes at the waist, ribs and hips, another corset shape may suit you better.
Contact us with your waist, rib and hip measurements, your torso length and the style you’re considering. We can help you choose before you order.
Buying a Demi Corset?
Our Demi Corset incorporates stretchy powermesh, so use the sizing guidance on its own product page. Don’t apply the traditional non-stretch corset calculation to it.
Comparing What Katie Did corsets
Once you have your measurements, you can narrow down the styles that suit your proportions. Start with the fit around your ribs and hips and the length you can comfortably wear, then consider the waist shape you want to create.
Standard and extreme corsets
Our standard and extreme underbust corsets offer different proportions. An extreme silhouette has a greater difference between the waist and the ribs and hips, creating a more pronounced curve.
“Extreme” doesn’t automatically mean it is the next corset you should buy as you become more experienced. Your natural proportions matter too: choose the shape whose measurements work with your body and your intended waist reduction.
Compare the sizing information for both versions before deciding. A more dramatically curved corset will only give the desired fit if its rib and hip dimensions suit you.
Shorter or longer styles?
A shorter corset concentrates its shaping around the waist and leaves more of your torso uncovered. It can be useful if you have less space between your ribs and hips, or prefer greater freedom of movement.
A longer corset extends further over the hips and lower abdomen, giving more coverage beneath clothing. Check its length carefully against your body, particularly when seated.
A more flexible option: the Demi Corset
Our Demi Corset combines a traditional corset busk and boning with stretchy powermesh and an elastic waist tape. The stretch allows more give than a traditional non-stretch corset, offering another option for those who want waist definition with flexibility.
It has its own fit and sizing guidance, so compare your measurements with the Demi Corset product page before ordering.
Let your measurements lead
You may love the appearance of a particular corset, but another shape could give you a better fit and a more balanced silhouette. If you’re choosing between styles, send us your measurements and tell us how you plan to wear your corset. We can help you narrow down the options.
What Katie did Corsets
How to put on and lace your corset
Putting on a corset takes a little practice, so allow yourself 10–15 minutes the first few times. A mirror that lets you see the lacing at the back is helpful while you learn.
1. Loosen the laces
Before putting your corset on, loosen the back laces generously from top to bottom. Leave them threaded through the eyelets. You need enough room to fasten the front without pulling or straining it.
2. Position your corset and fasten the front
Wrap the corset around you with its narrowest point sitting at your natural waist. Fasten the busk—the row of metal studs and loops at the front—checking that every fastening is securely connected.
If you’re struggling to bring the front together, loosen the back further rather than forcing the busk.
3. Tighten gradually towards the waist
For laces with pulling loops at the waist, sometimes called “bunny ears”, work the slack towards those loops. Start at the top and work down to the waist, then work from the bottom upwards to the waist. Pull the waist loops to take up the slack.
Repeat in small stages, adjusting both sides evenly. This gives you more control than trying to tighten everything with one strong pull.
4. Check the position and lacing gap
Check that the corset is centred and its waist sits at your natural waist. Aim for an even gap at the back, with the two edges running parallel.
You don’t need to pull the back edges together. Concentrate on an even, comfortable fit rather than achieving the smallest possible gap.
5. Tie the laces
Once the corset feels comfortably firm, tie the waist loops into a secure bow at the back. Check that you can sit comfortably before getting dressed.
If it feels painful, pinches or restricts your breathing, loosen it straight away. We’ll cover the finer points of checking your fit in the next section.
How to take off your corset
Untie the bow and gradually work the slack back through the lacing above and below your waist. Loosen the corset fully before undoing the front busk.
The front fastenings should come apart easily once the tension is released. If they don’t, loosen the laces further. Trying to open the busk while the corset is still tightly laced can damage it.
Getting used to wearing your corset
Once you’ve checked the fit, give yourself time to become familiar with wearing your corset. Start at home, when you can easily adjust the laces or take it off, rather than saving its first outing for a special occasion.
Does a corset need seasoning?
“Seasoning” is a term used for breaking in a new corset. At What Katie Did, we believe a corset should fit well from the first try-on. Wearing it in allows the fabric to soften and mould slightly to your body, but it won’t transform the garment’s size or proportions.
You may find you can lace a little more closely after a few wears. There’s no need to force this or follow a rigid schedule: comfort and fit should guide you.
Begin with short periods of wear
After checking the fit, loosen your corset a little and wear it for a short period while you get used to the feeling. Build up gradually if it remains comfortable, adjusting the lacing whenever you need to.
There is no target number of hours you need to achieve. Wearing a corset occasionally to create a particular silhouette is a perfectly good reason to own one.
Practise before your first outing
Try your corset with the clothes and lingerie you plan to wear. Sit down, walk around and check how everything feels together. This gives you time to make adjustments before you’re getting ready to leave.
Allow a little extra dressing time while lacing still feels unfamiliar. With practice, it becomes a much more straightforward part of getting dressed.
Comfort comes before a smaller waist
You don’t have to tighten your corset further each time you wear it, or close the gap at the back. A comfortable fit that gives you the silhouette you enjoy is the aim.
If you experience pain, numbness or difficulty breathing, loosen or remove your corset. Don’t treat discomfort as something you need to endure while breaking it in.
What to wear under and over your corset
A corset can be the foundation beneath your outfit or a beautiful part of it. Planning your layers helps you get the silhouette you want and makes dressing a little easier.
A light layer underneath
For frequent wear, a thin, close-fitting cotton camisole makes a useful corset liner, helping protect the garment from perspiration and skin oils. Smooth out any wrinkles before tightening your laces, as folds can become uncomfortable under a firmly fitted corset.
There’s no need for a specialist liner: a simple stretch cotton camisole can do the job.
Choosing your bra
An underbust corset lets you choose your own bra and the bust shape you want to create. A bullet bra gives a distinctive pointed vintage silhouette, while a more rounded cup creates a different line beneath your clothes.
Put your bra on before your corset and check that the corset’s top edge sits comfortably beneath it without pushing against the cups or underwires.
Knickers, suspenders and stockings
Think about practicalities as well as the finished look. Wearing your knickers over your corset makes bathroom visits easier, as you won’t need to unlace each time.
If you’re wearing a suspender belt, check where its waistband and fastenings sit in relation to the corset. Try the combination before your first outing so you can arrange the layers comfortably and reach your suspender clips easily.
Wearing a corset beneath clothing
Try your corset beneath the actual outfit you intend to wear. Fabric weight, seams and the cut of the clothing all affect how much of the corset’s outline shows.
A dress fitted closely at the waist may look wonderful over a corset, but check the fit through the ribs and hips too. Smooth the laces and bow beneath your clothes, and check the result from the front, side and back.
Wearing your corset on show
An underbust corset worn over a blouse or dress makes the waist a focal point. Keep the fabric underneath smooth as you lace, particularly around side seams and fastenings.
A modesty panel is a piece of fabric that sits behind the back lacing, covering the gap. It can give a more finished appearance when your corset is on show. Check the individual product description to see whether a panel is included or available separately.
Caring for your corset
A little care after each wear helps keep your corset fresh and looking beautiful. Wearing a thin cotton layer underneath and airing it afterwards will reduce the need for cleaning.
Air after wearing
Drape your corset over the back of a clean chair or a suitable hanger, with its lining exposed to the air. Let any moisture dry fully before putting it away.
Clean with care
Follow the care instructions supplied with your corset. We recommend professional dry cleaning; tell your cleaner that the garment contains steel boning and a metal busk.
For a small mark, gentle spot cleaning may be enough. Test an inconspicuous area first and avoid soaking the fabric. Take particular care with pale colours, as local cleaning can leave a water mark.
Store without crushing
Once your corset is dry and aired, store it somewhere clean and dry. Avoid folding it across the boning or placing heavy items on top of it.
Check the laces and fastenings
Occasionally check for fraying laces, loose stitching or damage around the eyelets and busk. If you notice a problem, contact us for advice before continuing to wear it.
Always loosen the laces fully before fastening or unfastening the front. This simple habit makes dressing easier and helps protect the busk from unnecessary strain.
Personal fitting help
Sometimes a tape measure and a size chart still leave you with questions. If you’re choosing your first corset, deciding between two styles or checking the fit of one you’ve just received, our team is here to help.
When you contact us, please include:
- Your firmly measured waist, rib and hip measurements in inches.
- Your torso length.
- The corset style you’re considering, or the style and size you’ve bought.
- How you’d like to wear it—for example, beneath a fitted dress or on show over a blouse.
If you’re checking a corset you already have, tell us what feels right and where you’re having difficulty. Front and back photographs can help us assess its position and lacing, if you’re comfortable sharing them.
You’re also welcome to book a fitting appointment at our HQ in Pangbourne, Berkshire, for advice in person.
A beautiful corset should suit you as well as your wardrobe. If you’re unsure, get in touch before ordering and we’ll help you find your starting point.
Corset Questions? Use the form below which is sent direct to our Corset Fitting Desk!