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It's our aim to get you into perfectly fitting lingerie first time around. It would make life a lot easier wouldn't it? Luckily most of our lingerie is made from stretchy powermesh which makes it easy to fit. If you are looking at an item which cinches your waist (like our Waist Cinchers or Waspies) you will need to grab a tape measure and check your waist measurement as it needs to fit perfectly to cinch your waist, but with everything else fit is pretty easy. If, after reading the notes below, you're still unsure, grab a tape measure and talk to us on 'live chat' so we can quickly resolve any queries before you place your order.  Don't worry if you don't have a tape measure, simply email Robyn  your name and address and she'll pop one in the post for you (robyn@whatkatiedid.com). 

how to measure for lingerie

'Highly recommend dropping the team an email for help with fit, the response was fast and the advice sound.' - Duckie

Please note, unless you are purchasing one of our Waist Cinchers or Waspies our garments will fit a couple of inches either side of the measurements below. For Waist Cinchers and Waspies you need to choose the size closest to your natural waist measurement: if you are between sizes please choose the smaller size.

Size 8 - Bust 33"/85cm, Waist 23"/58cm, Hips 33"/85cm

Size 10 - Bust 35"/87.5cm, Waist 25"/62.5cm, Hips 35"/87.5cm

Size 12 - Bust 37"/92.5cm, Waist 27"/67.5cm, Hips 37"/92.5cm

Size 14 - Bust 39"/97.5cm, Waist 29"/72.5cm, Hips 39"/97.5cm

Size 16 - Bust 41"/102.5cm, Waist 31"/77.5cm, Hips 41"/102.5cm

Size 18 - Bust 43"/107.5cm, Waist 33"/82.5cm, Hips 43"/107.5cm

Fitting notes and measurements are included in all garment descriptions where you need to pay special attention. Simply click the 'size and fit' tab at the top of each product description (underneath the product description on the mobile version of our site).

You should select your usual bra size when shopping with What Katie Did. The only exception is if you are a a DD+ cup size and are looking to purchase a soft cup Bullet Bra. Check out our All About Bullet Bras page for all the details.

'Sister' Bra Sizes

If you have purchased a bra (either from us, or elsewhere) and the size isn't quite right, it's easy to work out what's gone wrong and how to find the right size for you. Bra cups are 'cross graded' which means the the same cup is used for several different sizes. If your band is too tight, but the cup fits perfectly, then you need to go up a band size and down a cup size (this will make the band 2" longer, but the cup the same as the first size).

For example:

28F has the same cup as a 30E, 32DD, 34D, 36C and 38B

28FF has the same cup as a 30F, 32E, 34DD, 36D and 38C

28G has the same cup as a 30FF, 32F, 34E, 36DD and 38D

Our lingerie is sized either by bra or dress size.

Our lingerie is sized either by bra or dress size.

Shapewear is designed to smooth and shape the torso, concentrating on the waist and hips. It's important to get these measurements correct when determining your dress size.

To determine your waist size (1) measure the narrowest part of your torso firmly. Your natural waist might be a lot higher than you imagine and should be several inches smaller than your jean size. Measure your hips (2) at the widest point.

how to measure for vintage lingerie


Our Merry Widow and Corselette are sized using bra sizes. As both garments cover the body, the body size also needs to be taken into account. The band sizes of these garments roughly fit:

Band size 32 = dress size 10, 34 = dress size 12, 36 = dress size 14 and 38 = dress size 16 (of course, these are What Katie Did dress sizes which might be a size smaller than what you're used to, see our fitting room page for the measurements of our dress sizes)

If you wear, for example, a 32D bra but are a dress size 14 you will need to adjust your corselette/Merry Widow size so it fits correctly on the body by selecting a 36B (if you go up a band size you need to go down a cup size: see our bra sizing page for more info). 

Our knickers contain powermesh and are stretchy so the waist measurement isn't quite as critical as it is on shapewear. If you're in between sizes go for the size which matches your hip measurement. In general if you are between sizes always go for the larger size in knickers.

All of our supender belts contain powermesh so they will stretch to fit. They need to sit firmly on the waist so if you are between sizes always to for the the smaller size. 

how to put on a suspender belt

You need to take in to account both your waist and hip measurements when selecting a girdle. If you are wearing a girdle that finishes on your waist then it's best to choose the size closest to your waist measurement to avoid a muffin top. If you do have a large waist in comparision to your hips it might be better to go for a longline underbust girdle which will give you a smooth line from underbust to derriere.

Our underbust girdles contain spiral steel boning to ensure they don't roll down.

Girdles are designed to flatten your tummy and smooth your hips and derriere. Always step into your girdle.

Ideal under tight fitting pencil skirts.

how to put on a girdle

Designed to comfortably cinch your waist. Ensure that the reinforced shaping bands sit on the narrowest point of your waist for maximum sculpting.

Always choose the size closest to your waist measurement. It is possible to go down a size in our waist cinchers and waspies especially if you're used to wearing vintage style shapewear.

Waist Cinchers are great under full skirted 1950s style dresses with nipped in waists.

how to put on a waist cincher



For corset sizing please check out our All About Corsets page which has indepth information on how to choose the right corset for you.

The short answer is yes. Corsetry is designed to shape your figure, which means it has to be tight. We’ve tried to make our shapewear as easy to get into as possible, but a few items  need a little wriggle.

If you do think an item is too small, why not take a breather and try again later? Once you’re in you’ll look spectacular and remember, our shapewear is designed to be comfortable enough to wear all day.

Should you happen to break a garment trying it on send it back for a refund and tell them Katie sent you. It hasn’t happened yet but there’s always a first!

how to put on a merry widow

We have a dedicated page All About Stockings which tells you everything you need to know!

putting on fully fashioned stockings



London Boutique: What Katie Did, 26 Portobello Green, 281 Portobello Road, London, W10 5TZ
Tel: 0345 430 8943

Los Angeles Store: What Katie Did, 3420 W Magnolia Blvd, Burbank, California, 91505 USA
Tel: 1 877 221 2472 or 1 818 955 7710 (from outside US)

Head Office:

What Katie Did,
Unit 8 The Old Mill, 61 Reading Road,
Pangbourne, Berkshire, RG8 7HY

Tel: 0345 430 8743 or
+44 118 976 7676 (from outside UK)

Registered in England with company number: 05752881