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curvy underbust corset by what katie did
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Morticia Extreme Underbust Corset L4093

€231,95 EUR
Choose your colourBlack
Choose your size

For those who love their curves bold and beautifully defined, our Extreme Morticia Underbust Corset takes vintage shaping to the next level. Cut to the same elegant pattern as our bestselling Morticia, this curvy underbust corset is tailored for a more dramatic silhouette — designed for those with a 12” difference between waist and mid-hip.

At a Glance:

Colour Black or vintage peach
Fabric composition Fashion fabric 100% Polyester, lining and interlining 100% cotton
Details Spring steel busk, spiral and flat steel bones, 2 piece eyelets, waist tape
Country of manufacture Thailand 

 

HORIZONTAL MORTICIA CORSET MEASUREMENTS

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

Morticia Corset Waist Size Rib  Hip
18" 24.5"/62 cm 32"/81.5 cm
20" 26.5"/67.5cm 34"/86.5 cm
22" 28.5"/72.5 cm 36"/91.5 cm
24" 30.5"/77.5 cm 38"/96.5 cm
26" 32.5"/82.5 cm 40"/101.5cm
28" 34.5"/87.5 cm 42"/106.5 cm
30" 36.5"/92.5 cm 44"/112 cm
32" 38.5"/98 cm 46"/117 cm
34" 40.5/103cm 48"/122cm

 

VERTICAL MORTICIA CORSET MEASUREMENTS

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 11" / 28cm
Centre Back Length 14" / 35.5cm
Underbust to Hip (Princess) 9.75" / 25cm
Side Length from Underarm to Waist 5" / 12.5cm
Side Length from Waist to Bottom 5.75" / 14.5cm

 

With a waistline two inches smaller than the standard Morticia, it’s ideal for the naturally very curvy or for experienced wearers looking to size down. The result is an extreme underbust corset that delivers an unmistakably hourglass figure while maintaining the comfort and craftsmanship What Katie Did corsets are known for.

Inside, the structure is everything you’d expect from a serious corset: a spring steel busk, spiral and flat steel bones for balanced support, and an internal cotton waist tape to maintain strength through wear and training. The outer layer of matte satin (100% polyester bonded to 100% cotton) feels smooth and luxurious, while the baby pink 100% cotton lining adds a soft, vintage touch.

Whether worn for daily waist training or reserved for special occasions, the Extreme Morticia offers the perfect fusion of structure, elegance, and drama. Ethically crafted in Thailand, it’s proof that extreme curves can be achieved with grace and comfort.

Optional modesty panel available separately. Specialist dry clean only.

Standard vs Extreme Corsets

Corset FAQs

How to measure yourself for a Corset

Our corsets are sized by reduced waist size — the measurement of the corset when it’s fully closed. For example, a 24" corset measures 24" closed.

To find your size, measure your natural waist firmly (the narrowest point, higher than where your jeans sit) and subtract 3–5 inches. The exact reduction depends on the corset style and your build, and we include specific guidance with each corset.

For Underbust Corsets, we list both the vertical lengths and circumference measurements. Please compare these to your own body measurements to ensure the best fit and the right shape for your torso.

Remember: the top and bottom measurements we provide are for the corset fully closed. Most people wear their corset with a 2–3" lacing gap, so your fit will be slightly larger when worn.

It's not just about your waist!


While your waist measurement is the key number when choosing a corset, your rib and hip measurements matter too. In the video, I show exactly what can happen when these are overlooked by trying on each of our corset styles—some fit beautifully, while others simply won’t sit correctly. Checking all three measurements ensures you select the shape that truly suits your figure.

Standard vs Extreme Corsets

Our Standard cuts work beautifully for most figures, while our Extreme Corsets offer a far more dramatic curve. They’re ideal if you’re naturally very curvy or if you’re ready to size down from a Standard corset and want a tighter, more sculpted silhouette.

Do you need a custom Corset?

Years ago it might have been the obvious choice, but things have changed. As I explain in the video, going bespoke isn’t always the best option—unless you have plenty of time and budget to spare.

What matters most at the beginning is choosing a corset that closely matches your measurements, and for most people an off-the-shelf corset is absolutely fine unless your proportions are very extreme. Once you’ve been wearing corsets for a while and understand how your body responds, then you can consider investing in a custom piece.

Muscle and Squishiness

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 difficulty 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.

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