Zita Extreme Underbust Corset L4095

Unveiling our Extreme Zita Satin Corset, an elevated version of our classic design tailored for a more pronounced silhouette. Crafted with the same meticulous attention to detail as our standard Zita, the Extreme Zita features a waistline cut 2 inches smaller, ideal for those who desire additional waist reduction and a more dramatic shape.

Key Features:

  • Enhanced Waist Reduction: The Extreme Zita is tailored with a waist 2 inches smaller than our standard version, offering a more pronounced silhouette. Suitable for both daily waist training and occasional wear, it provides comfort without compromising style.

  • Premium Materials: Crafted from 100% polyester matte satin, bonded to 100% cotton, and adorned with a charming baby pink cotton lining. The internal cotton waist tape ensures durability and support, while optional modesty panels are available for separate purchase.

  • Structural Excellence: Mirroring our standard Zita, the Extreme version features a spring steel busk, one steel flat bone next to the busk, and flat bones on either side of the 2-piece lacing eyelets. .

  • Ethical Craftsmanship: Crafted ethically in Thailand.

  • Specialist dry clean

Embark on a journey to an amplified silhouette with the Extreme Zita Steel Boned Underbust Corset—where precision meets bold elegance, redefining comfort and style for those with a more athletic figure.


The rib and hip are measured approx 5" up and down from the waist.

Extreme Corset Waist Size Rib  Hip
18" 24" / 61cm 30" / 76cm
20" 26" / 66cm 33" / 84cm
22" 28" / 71cm 35" / 89cm
24" 30" / 76cm 37" / 94cm
26" 32" / 81cm 39" / 99cm
28" 34" / 86.5cm 41" / 104cm
30" 36" / 91.5cm 43" / 109cm
32" 38" / 96.5cm 45" / 114.5cm
34" 40" / 102cm 47" / 124.5cm



It is important to check the length of your torso to ensure that the bottom of your corset doesn’t dig into your thighs or breasts when sitting.

Busk Length 10.75" / 27.5cm
Centre Back Length 11.25" / 28.5cm
Underbust to Hip (Princess) 9.75" / 25cm
Side Length from Underarm to Waist 5" / 12.5cm
Side Length from Waist to Bottom 5" / 12.5cm


Selecting the ideal corset isn't solely about your waist size. It involves your measurements, your muscle/fat ratio, and your familiarity with wearing corsets. To determine your perfect fit, refer to the measurements provided for all our corsets ⌛ by scrolling just below the images on this page. It's crucial to purchase based on your measurements, as a proper fit is paramount. Should you encounter any difficulties, don't hesitate to reach out to us; we're here to assist you every step of the way.

How to Measure Yourself for a Corset

Standard vs Extreme Corsets

Choose your colour Black
Choose your size 18"

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Fitting Room: Corset Sizing

How to measure for a corset

Our Corsets are sized by 'reduced waist size'. This means the size of the corset when fully closed. For example, a size 24" corset will measure 24" when fully closed. To determine your corset size you need to measure your waist firmly and deduct a number of inches.

Please note that your jean size is not your waist measurement! You need to measure the narrowest part of your torso which is a lot higher up. The amount of inches you take off will depend on a variety of factors, including the corset style and your build, but is generally between 3 and 5 inches (precise details are included for by corset style).


Please be aware that you need to check your measurements before ordering. For our Underbust Corsets we supply both the vertical lengths and circumference . Please compare your measurements to ours to determine which corset will be right for your figure type.

Finally, be aware that the top and bottom corset measurement we provide are for the corset being entirely closed at the back. It is pretty standard to aim for a gap of 2".

Corset Measurements

You can find the measurements for each corset in the product descrption. If you would like to compare all of our corsets at once, the button below takes you to a Google Doc Spreadsheet where you can see the measurements for all our corsets side by side. This is easier than looking at each corset style separately on our site. Hover over the little triangles for extra information.

Corset Q&As

Why the Cut of your corset Matters

Your measurements are far more important than the style of corset you like on our website. In this video I wear some of our corsets to show you that not every corset suit every figure and why you need to choose the corset that comes closest to your natural measurements for the best fit.

Do I Need a Bespoke (Custom Corset?)

Your measurements are far more important than the style of corset you like on our website. In this video I wear some of our corsets to show you that not every corset suit every figure and why you need to choose the corset that comes closest to your natural measurements for the best fit.

Standard Vs Extreme Corsets

I developed the first corset line for What Katie Did in 2004, and over the years, have refined our designs into a capsule collection that is designed to suit a wide range of different figure shapes, torso lengths and sizes.

Unique to What Katie Did is our range of standard and extreme underbust corsets. You can start with the standard version of one of our corsets then move on to the extreme version if you want to take your waist training further.

Your Squishability!

Our corsets come in reduced waist sizes 18" to 34" which roughly equals UK dress sizes 8-18, US dress sizes 4 to 14.

If you are a UK dress size 8 (US 4) you will have less body fat than if you are a UK dress size 18 (US 14), so it will be harder for you to immediately get a dramatic corseted shape. We recommend you stick with the sizing recommendations for each of our corsets, which can be seen by clicking the sizing tab at the top of each product description.

If you are a UK dress size 12-14 (US 8-10) you should be able to get a great corseted shape, without too much effort and without worrying too much about flub at the top and bottom of the corset. Again, you need to go by our sizing recommendations. The only thing that might cause you difficultly is if you are very athletic and have a high muscle to fat ratio. Then, like your more slender friends, you will find it harder to waist train as muscle is far less squishy than fat.

If you are a UK dress size 16 (US 12) or above, then you're in luck as fat is squishy and you'll be able to quickly tight lace yourself to create hourglass curves. You might want to go for a size smaller than stated as it's common for curvier girls to be able to reduce their waist by 6 or even 7 inches with one of our curvier corsets! However, please check the rib and hip measurements of our corsets before doing this as if they are too small for you, they will result in what can only be called, rather unglamorously, flub.  

Comparing Waist Cinchers & Corsets

Cinchers, waspies, corsets oh my!

If you're confused about the different waist shaping garments available we've put together a video not only explaining the differences, but showing each garment on model Miss Sugar Rush so you can really see the difference.

What is a Demi Corset (& Sizing)?

Find out about our Demi Waspie Corset and how the sizing works for both our Demi Waspie and Demi Corset.

Our Demi Waspies and Corsets are half way between a powermesh waist cincher/waspie and full non stretch corset.

The button below takes you to a Google Doc Spreadsheet where you can see the measurements for our Demi Corsets both unstretched and stretched.

Extras: Modesty Panels

A modesty panel is a piece of fabric that covers the gap between the your corset lacing and your back.

All of our corsets used to include a modesty panel, but as people tend to either love them or hate them we now sell them as an optional extra with our underbust corsets. They are still included with our overbust corsets which are more likely to be on show.

If you are wearing your corset with a corset liner, then you really don't need a modesty panel. However, if you do wear your corset over clothing you might like to wear one as it can look neater.

Our modesty panels can be laced in to your corset, or simply slotted in.

Customer Reviews

Based on 4 reviews

Really love your corset. It fits very well and is giving me a nice shape bring in my waist at the sides and my tummy in front.

Impeccable, bonne qualité, délais de livraison rapide, juste une douane chère.