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Sizing Guide

Our sizing is as easy as 1, 2, 3...

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.

Refer to the chart below. It's really that easy.

Take your pre - pregnancy clothing size, and look across the chart to find your Isabella Oliver size.

So, if you were usually a UK 12 before you were pregnant, just order a Isabella Oliver size 3, or if you are a UK 14, the our size 4 is for you.

If in doubt, please check against our measurement chart to find your correct size against your body measurements or contact our customer services team.

Isabella Oliver Clothes Sizing Guide

 0123456
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 6-8 10 12 14 16 18-20 22
 X-SmallSmallMediumLargeX 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 8 10-12 14-16 18-20 22
Isabella Oliver Pre PregnancyBustChestWaistTop HipLow HipArm
  cm in cm in cm in cm in cm in cm in
0 81 32 78 30¾ 65 25½ 77 30¼ 92 36¼ 54.4 21½
1 83.5 33 80.5 31¾ 67.5 26½ 79.5 31¼ 94.5 37¼ 54.7 21½
2 86 34 83 32¾ 70 27½ 82 32¼ 97 38¼ 55 21½
3 91 35¾ 88 34½ 75 29½ 87 34¼ 102 40¼ 55.6 21¾
4 96 37¾ 93 36½ 80 31½ 92 36¼ 107 42 56.2 22
5 101 39¾ 98 38½ 85 33½ 97 38¼ 112 44 56.8 22½
6 108 42½ 105 41½ 92 36¼ 104 41 119 47 57.4 22½

* All measurements are based on our standard size 2/UK size 10, 173cm/5' 8" model.

Isabella Oliver Trousers Lengths

Isabella Olivercmin
Regular 81 32
Long 86 34

Isabella Oliver Jeans Sizing Guide

 123456
UK Pre-pregnancy size 8 10 12 14 16-18 20
Isabella Oliver Maternity sizing 25 27 29 31 33 35

Expecting Twins?

If you are pregnant with twins, we recommend you go up a size. So, if you were a size 12 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.

Bust

Measure around the fullest part of your bust ensuring the tape is straight across your back

Waist

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

Top hip

Stand with your feet together and measure around your top hip which should be approximately 10cm below your natural waistline

Low hip

Stand with your feet together and measure around the fullest part of your hips at the top of your legs, be approximately 23cm below your natural waistline

Inside leg

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

Hosiery sizing

Isabella Oliver Luxe Opaque Tights are essential for your maternity wardrobe during the colder months.

Small (S)Medium (M)Large (L)
UK size 10 12 14
US/CA size 4 6 8
EU size 36 38 40
AU/NZ Size 10 12 14

Footwear

UK SizeEU SizeUS 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.