Sizing guide

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 for a flawless fit at every stage.

Please refer to the chart below for clarification. Simply, take your pre-pregnancy clothing size, and look across the chart to find your Isabella Oliver size.

So, if you were usually a US 8 before you were pregnant, just order an Isabella Oliver size 3. Additionally, if you are a US 10, then our size 4 is for you.

If you are in any doubt, please check against our measurement chart to find your correct size against your body measurements. Alternatively, you can also contact our customer services team. 

Isabella Oliver Clothes Sizing Guide

0 1 2 3 4 5 6
UK size 4-6 8 10 12 14 16-18 20
US 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

 

  X-SMALL SMALL MEDIUM LARGE X-LARGE
UK size 6 8-10 12-14 16-18 20
US size 2 4-6 8-10 12-14 16
EU size 34 36-38 40-42 44-46 48
AU/NZ size 6 8-10 12-14 16-18 20

Isabella Oliver measurement guide

ISABELLA OLIVER PRE-PREGNANCY BUST CHEST WAIST TOP HIP LOW HIP ARM
  cm in cm in cm in cm in cm in cm in
0 81 32 78 30 3/4 65 25 1/2 77 30 1/4 92 36 1/4 54.4 21 1/2
1 83.5 33 80.5 31 3/4 67.5 26 1/2 79.5 31 1/4 94.5 37 1/4 54.7 21 1/2
2 86 34 83 32 3/4 70 27 1/2 82 32 1/4 97 38 1/4 55 21 1/2
3 91 35 3/4 88 34 1/2 75 29 1/2 87 34 1/4 102 40 1/4 55.6 21 3/4
4 96 37 3/4 93 36 1/2 80 31 1/2 92 36 1/4 107 42 56.2 22
5 101 39 3/4 98 38 1/2 85 33 1/2 97 38 1/4 112 44 56.8 22 1/2
6 108 42 1/2 105 41 1/2 92 36 1/4 104 41 119 47 57.4 22 1/2

*All measurements are based on our standard UK size 2/UK size 10, 160-165cm (5'4 - 5'6) customer.

Isabella Oliver Trousers Length

ISABELLA OLIVER CM IN 12 14 16
Regular 81 32 29 31 33
Long 86 34 29 31 33

Isabella Oliver Jeans Sizing Guide

ISABELLA OLIVER 1 2 3 4 5 6
UK Pre-pregnancy size 8 10 12 14 16-18 20
Isabella Oliver Maternity sizing 25 27 29 31 33 35

Cake Bra Size Guide

Band Size

Cup Size

B C D DD E F
32 S S S S S M
34 S S M M M M
36 M M M L L L
38 M L L L L XL
40 L L XL XL XL XL
42 XL XL XL XL XL -

Expecting Twins?

If you are pregnant with twins, we recommend you go up a size. Therefore, if you were a US size 8 (Isabella Oliver size 3) before you were pregnant, order an Isabella Oliver size 4.

Clothing measurements in centimeters and inches can be found on our individual product pages. If you require more information please contact us and we'll be delighted to help you.

Size Guide

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. 

Arm length

With a gentle natural bend in the arm, hold the tape on your shoulder bone and measure over your elbow to your wrist. 

 

Footwear

UK SIZE EU SIZE US SIZE
3 36 5
4 37 6
5 38 7
6 39 8
7 40 9
8 41 10

Our collection is designed to make you feel fabulous throughout your pregnancy. Please contact us if you are in any way disappointed with our clothes or service, so we can make things right.