Size Guide

Underwire Bra Size Guide 

Not sure of your First Thing size? All you need is some quick measurements to find your perfect size. First step is to determine your ‘under bust’ size. The second step is to determine your cup size. Then use the matrix below to find your perfect size. 

 

BODY SIZE 10 12 14 16
UNDER BUST 68 - 72 73 - 77 78 - 82 83 - 87
Cup A 82-84  87-89  92-94  97-99
Cup B  84-86  89-91  94-96  99-101
Cup C  86-88  91-93  96-98  101-103
Cup D  88-90  93-95  98-100  103-105
Cup DD  90-92  95-97  100-102  105-107
Cup E  92-94  97-99  102-104  107-109

 

Soft Bra Size Guide

SIZE XS S M L
CLOTHING SIZE 8 10 12 14
UNDER BUST 68 - 67 68-72 73-77 78-82


Bottoms Size Guide

SIZE XS S M L XL
CLOTHING SIZE  8 10 12 14 16
HIP MEASUREMENT (CM) 87-92 92-97 97-102 102-107 107-112


Sister Sizing  

Did you know that if you fit into one bra size, chances are you’ll fit into several other sizes too? Bra size doesn’t work the same way as clothing sizes as the band size varies with the size of the cup like a ratio.

If you go up a band size, you’ll go down a cup size and similarly, if you go down a band size, you’ll go up a cup size.

Here’s a simple chart to show your sister size – use the colours and numbers to help match the sizes. For example if you’re a 12D, you could also fit a 10DD (down a band size and up a cup size) or 14C (up a band size and down a cup size)

8 10 12 14 16 18 EXAMPLE
A A A A A A
A B B A B B A 14D is equivalent to 16C and 12DD
C C C C C C A 12E is equivalent to 10F and 14DD
D D D D D D A 12E is equivalent to 10F and 14DD
DD DD DD DD DD DD An 18DD is equivalent to 16E and 20D
E E E E E E A 12E is equivalent to 10F and 14DD
F F F F F F A 12E is equivalent to 10F and 14DD
G G G G G G