Size Chart

Measurements

We've designed our maternity clothes in line with your pre-pregnancy clothing size for extra ease, giving you one less thing to think about. Many pieces are infused with our signature ruching and wrapping, making them totally adaptable for a flawless fit at every stage.

Expecting Twins?

If you are pregnant with twins, we recommend you go up a size.

If you need further help with sizing, our friendly Customer Service team would be delighted to help.

Isabella Oliver Bust Chest Waist Top Hip Low Hip Arm
IO Size US Size cm in cm in cm in cm in cm in cm in
0 0-2 XS 81 32 78 30¾ 65 25½ 77 30¼ 92 36¼ 54.4 21½
1 4 S 83.5 33 80.5 31¾ 67.5 26½ 79.5 31¼ 94.5 37¼ 54.7 21½
2 6 86 34 83 32¾ 70 27½ 82 32¼ 97 38¼ 55 21½
3 8 M 91 35¾ 88 34½ 75 29½ 87 34¼ 102 40¼ 55.6 21¾
4 10 96 37¾ 93 36½ 80 31½ 92 36¼ 107 42 56.2 22
5 12-14 L 101 39¾ 98 38½ 85 33½ 97 38¼ 112 44 56.8 22½
6 16 XL 108 42½ 105 41½ 92 36¼ 104 41 119 47 57.4 22½

International Sizing

Isabella Oliver
Size		 0 1 2 3 4 5 6
UK size 4-6 8 10 12 14 16-18 20
US/CA size 0-2 4 6 8 10 12-14 16
EU size 32-34 36 38 40 42 44-46 48
AU/NZ size 4-6 8 10 12 14 16-18 20

How to measure

To ensure the perfect fit, follow the guidelines below to measure yourself.

Bust

Wearing a bra, place the tape around the fullest part of your bust, ensuring the tape is straight across the back. 

Waist

This is the slimmest part of your natural waistline. Above the naval and below the ribcage.

Hip

Place the tape around the fullest part, usually over your bottom or at the top of your thighs.

Inside leg

The measurement between the top of your leg (at the crotch) to the ankle.