Sizing Swimwear

Your usual dress size is mostly the right size for a BETTY DIAMOND  one piece swimsuit.

If you are a size 10/12 (Aus) take a 0.
If you are a size 12/14 (Aus) take a 1.
If you are a size 14/16 (Aus) take a 2.
If you are a size 16/18 (Aus) take a 3.
Choose your usual bra cup size.


The length measurement has little to do with your height.
You may be short and have a long torso.
You may be tall and have a short torso.
Measure from the underbust line – see illustration below– down between your legs to the point at the centre of your body where all the seams meet – yes there!
Make sure you are standing up straight.
Add 2.5cm (1”) to the number you get and that is your length measurement for a BETTY DIAMOND one piece swimsuit.
SIZES 1 2 3
Under 50cms (19 ¾) is a REGULAR
Over 50cm (19 ¾) is a LONG
Under 47 cm (18 ½) is a REGULAR
Over 47cm (18 ½) is a LONG

If your hips or your belly are larger than your top you’ll probably need a LONG regardless of your torso measurement – the extra width will take up the length.


SIZE 0 1 2 3
Australian 10-12 12-14 14-16 16-18
UK 10-12 12-14 14-16 16-18
Europe 40-42 42-44 44-46 46-48
Global S-M M-L L-1X 1X-2X
US 8-10 10-12 12-14 14-16