Lingerie Sizing

Bra Sizing

A-D Cup?

You should select your usual bra size when shopping with What Katie Did. Our sizes are generally in line with brands including Agent Provocateur, Triumph and Gossard.

DD+ Cup?

Please note that we are not a modern full cup brand which specialises in DD+ cups which means that all of our bras are sized traditionally: your underbust measurement and band size should not be the same. Our band sizes are designed to fit an underbust measurement 3-4 inches smaller so, for example, a size 32 is designed to fit an underbust 28-29".

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 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

General Sizing

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.

Our clothing is made from non stretch fabrics and the sizing is very much in line with other reproduction brands like Vivien of Holloway, House of Foxy, Trashy Diva and Pinup Girl Clothing.

If, after reading the notes below, you're still unsure, grab a tape measure and contact 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 Kelly your name and address and she'll pop one in the post for you (

Size Chart

The measurements below are to be taken as a rough guide as, with the exception of corsets our lingerie stretches and while our clothing is none stretch there is ease built in for a comfortable fit. If you are familiar with other reproduction clothing brands you should be the same size in our clothing ranges.

Dress Size Bust Waist Hip
Size UK 8

Bust 32"/81cm

Waist 23"/58cm
Hips 33"/85cm
Size UK 10

Bust 33"/84cm

Waist 25"/62.5cm
Hips 35"/87.5cm
Size UK 12

Bust 35"/89cm

Waist 27"/67.5cm
Hips 37"/92.5cm
Size UK 14

Bust 37"/94cm

Waist 29"/72.5cm
Hips 39"/97.5cm
Size UK 16

Bust 39"/99cm

Waist 31"/77.5cm
Hips 41"/102.5cm
Size UK 18

Bust 41"/104cm

Waist 33"/82.5cm
Hips 43"/107.5cm
Size UK 20

Bust 43"/109cm

Waist 35"/89cm
Hips 45"/114cm
Size UK 22

Bust 45"/114cm

Waist 37"/95cm
Hips 47"/119.5cm

Size UK 24

Bust 47"/119.5cm

Waist 39"/97.5cm

Hips 49"/124.5cm

Size UK 26

Bust 49"/124.5cm

Waist 41"/102.5

Hips 51"/129.5cm

Stretch & Ease

Most of our lingerie is made from stretch fabrics so the measurements here are a rough guideline. Our garments will fit a couple of inches either side of the measurements below, especially with larger sizes which do have a lot more stretch.

If you are used to wearing other reproduction vintage brands then our sizing should be inline with them. If you normally wear high street brands you might need to go up one size in our shapewear items which are designed to be worn very tightly.

Waist Cincher & Waspie Sizing

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.

Demi Waspie & Corset Sizing

Demi Waspie Corset and Demi Corset

Corsets are usually made from non stretch fabric and sized by reduced waist size. Our Demi Waspie Corset and Demi Corset are made from a double layer of powermesh which means the garment stretches which means we've sized these garments by dress size, not waist size. You need to choose the dress size closest to your waist size, sizing down if you're in between sizes.

Corselette & Merry Widow Sizing


Our Corselette and Merry Widows are sized by bra size, but as they shape your whole torso you need to take your dress size into account too.

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).

Girdle Sizing


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.

Suspender & Knicker Sizing

Our knickers contain powermesh and are stretchy so the waist measurement isn't quite as critical as it is on shapewear (with the exception of our CC09 French Knickers). 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.