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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 below chart. 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 you are in doubt please check against our measurement chart to find your correct size against your body measurements.

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

Waist

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

Top hip

Stand with your legs together and meassure around your top hip which should be aproximately 10cm below your natural wasteline

Low hip

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

Inside leg

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

Hosiery sizing

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

HeightTo fit skirt / Hip Size
UK/EUR 8-10,(36-38),88-92cm,(34.5-36ins) 12-14,(40-42),96-101cm,(38-40ins) 16-18,(44-46),106-111cm,(42-44ins) 20-22,(48-50),117-123cm,(46-48ins)
150-160cm,(4ft 11ins - 5ft 3ins) S M L L
163-170cm,(5ft 4ins - 5ft 7ins) M M L -
173-178cm,(5ft 8ins - 5ft 10ins) M L L -
178-183cm,(5ft 10ins - 6ft) L L - -

Cake Lingerie Sizing

 SmallMediumLarge
UK size 10 12 14
US size 4 6 8
EU size 36 38 40
AU/NZ Size 10 12 14

Nearly Nude

 S/MM/L
UK 8-12 14-18
US 4-8 10-14
EU 36-40 42-46

Spanx Sizing

Use the below size chart for the Mama Spanx range. Use your pre-pregnancy weight to work out your size (click on the picture to enlarge).

IO Maternity Spanx Sizing

Footwear

UK SizeEU SizeUS Size
3 36 5
4 37 6
5 38 7
6 39 8
7 40 9
8 41 10

Bra Measurement Guide

A well-fitting bra is a wardrobe necessity, whether you are pregnant or are nursing. Follow our simple guide to find your perfect fit.

Step 1: Measure your band size

Step One

Simply measure around your rib cage, just underneath your bust (See line A). Make sure that your tape measure is flat and straight across the back, and read your measurement in either centimetres or inches. Then select your band size in the chart below.

cmInBandsize
68-72 27-28 32
73-77 29-30 34
78-82 31-32 36
83-87 33-34 38

Step 2: Measure your bust size

Step 2

For an accurate bust measurement, simply measure across the fullest part of your bust, leaving your tape measure fairly loose for absolute comfort (see line B). You can measure in either centimetres or inches.

Step 3: Find your perfect bra size

Using the chart below, locate your band size in the left hand column and follow the row across to locate your bust measurement using either centimetres or inches. Then see the top row of the chart to find your cup size. For example, if your band is 34 and your bust measurement is 37 inches (94cm) you will be a 34DD.

  BCDDDEFG
Band Size Bust size              
32 cm 83-85 86-88 89-90 91-93 94-95 96-98 99-100
  in 33 34 35 36 37 38 39
34 cm 86-88 89-90 91-93 94-95 96-98 99-100 101-103
  in 34 35 36 37 38 39 40
36 cm 89-90 91-93 94-95 96-98 99-100 101-103 104-105
  in 35 36 37 38 39 40 41
38 cm 91-93 94-95 96-98 99-100 101-103 104-105 106-108
  in 36 37 38 39 40 41 42

We hope you feel comfortable with our bra measurement guide but if you need further assistance please contact our customer service team, or see our fitting advice below.

Fitting Assistance:

Maternity bra fitting
Your ribcage will expand during your pregnancy. Therefore we recommend that you initially fit a maternity bra on the tightest hook so that you can then loosen it as your ribcage expands.

Nursing bra fitting
We recommend that you fit a nursing bra around the 36 week period. Your bust will go up in size when the milk comes in, so when you are fitting a nursing bra and you are still pregnant, slip a hand inside to ensure you have enough space. In the months following birth, your ribcage will slowly go back to normal. Therefore we recommend that you fit a nursing bra on the loosest hook. As your ribcage goes back, just tighten the bra.

When you are fitting your bra, here's what to look out for:

  1. Are the cups loose? We suggest you try going down one cup size.
  2. Do the cups look too tight causing bulging? If so, the cups are too small. Try going up one size so your bust fits comfortably within the cups.
  3. Are the shoulder straps digging in? The band of a bra provides most of the support and not the straps. If the straps are digging in, it could mean it is too loose and the straps are having to give more support than usual and hence digging in. Therefore we suggest you try a bra one band size smaller.
  4. Is the bra riding up on your back? Your bra needs to be at the same level all around your body. If it is arching up on your back, we recommend you try a bra in a band size smaller.
  5. Is your bra feeling too tight? Your bra should fit snugly but not be uncomfortably tight. You should be able to lift the band up to 1 cm away from your body. To begin with, please fit your maternity bra on the tightest hook so that you can loosen it as your ribcage expands. With a nursing bra, please fit it initially on the loosest hook so that you can tighten the bra as your ribcage shrinks back.

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.