February 26, 2021

How should a bra fit correctly and how do you measure your bra size at home?


Feeling grumpy? Distracted? Uncomfortable?

We’ve all been there: the discreet but ever-present nuisance of an ill-fitting bra.

A bra that fits properly is essential for everyday comfort. It also helps with posture and confidence. In the right bra, you both look and feel amazing.

So how do you know if a bra fits correctly?


How should a bra fit correctly?


Even if you’ve measured recently, bra size can change depending on age, weight, hormone fluctuations, pregnancy and a variety of other factors. In fact, you should measure your bra size every 6–12 months!

A bra that fits correctly will be comfortable. You won’t be able to feel the hook and eye, nothing will dig in or scratch, and the straps won’t slip off.

The bra's cups will fit the shape of your breast — no gap and no spilling over the top or to the side.

The straps will sit snuggly on your shoulders without digging in or falling off. Of course, you can adjust the straps to fit better, but if adjusting doesn’t help, then the band size is likely wrong

If your boobs are slipping out from underneath the band, you need a smaller band size. Or, if the band is riding up your back it’s too loose, so you should try a looser hook or a smaller band size.

Does this sound familiar for any (or all!) your bras? It could be time to get fitted!

You can go to get your bra professionally fitted. Or you can easily measure your bra size at home.


How to measure bra size at home


When measuring bra size at home, there are two elements to consider: the band and the cup.

To measure the band:

  1. Stand upright without a bra on.

  2. Get a tape measure and measure around your back and under your boob, i.e. where the band of a bra usually sits.

  3. Jot down how many inches this is. If it’s an even number, that’s your band size. If it’s an odd number, round it up.


To measure the cup:

  1. Put on your most comfortable bra. Your boobs are now in their optimal position, so that’s what you want to measure.

  2. Wrap the tape measure around your front and back, but this time in line with the fullest part of your bust.

  3. The difference in inches between this and your band size is your cup size:

·       0 = AA

·       1 = A

·       2 = B

·       3 = C

·       4 = D

·       5 = DD

·       6 = F

·       7 = FF

·       8 = G

·       9 = H


Now combine the band and the cup size to find your overall bra size. For example, if you have a band of 32 inches and a cup size C, you’re a 32C.

If you prefer a looser band, sister size to your correct band size (find out more about sister sizing here), for example, if you measure a 32D, you may prefer to wear a 34C or 36B


Now you’ve measured the right size, what bra style should you get? 


As with any item of clothing, different shapes and styles suit different bodies.

There’s no right or wrong here beyond going with what you feel most comfortable wearing. As a general guide:

Full cups and balcony bras provide comfort in terms of support.

Bralettes and unwired bras are comfortable in that they are less structured.


Finally, a bra that fits!

 For more tips and tricks on bra fitting, check out our video!


Whatever your size, shape and style, there’s a bra for you. Shop sizes ranging from 28DD to 44H in the Playful Promises collection today.


Size Guide
We want your Playful Promises purchases to fit perfectly. Please see our guide below for measuring and sizing information. Our sizes are listed in AU sizing.

Bra Guide

8A 30A 30A 80A 65A
8B 30B 30B 80B 65B
8C 30C 30C 80C 65C
8D 30D 30D 80D 65D
8DD 30DD 30DD/E 80E 65E
8E 30E 30DDD/F 80F 65F
8F 30F 30G 80G 65G
8FF 30FF 30H 80H 65H
8G 30G 30I 80I 65I
8GG 30GG 30J 80J 65J
8H 30H 30K 80K 65K
10A 32A 32A 85A 70A
10B 32B 32B 85B 70B
10C 32C 32C 85C 70C
10D 32D 32D 85D 70D
10DD 32DD 32DD/E 85E 70E
10E 32E 32DDD/F 85EF 70F
10F 32F 32G 85G 70G
10FF 32FF 32H 85H 70H
10G 32G 32I 85J 70J
10GG 32GG 32J 85K 70K
10H 32H 32K 85L 70L
12A 34A 34A 90A 75A
12B 34B 34B 90B 75B
12C 34C 34C 90C 75C
12D 34D 34D 90D 75D
12DD 34DD 34DD/E 90E 75E
12E 34E 34DDD/F 90F 75F
12F 34F 34G 90G 75G
12FF 34FF 34H 90H 75H
12G 34G 34I 90I 75I
12GG 34GG 34J 90J 75J
12H 34H 34K 90K 75K
14A 36A 36A 95A 80A
14B 36B 36B 95B 80B
14C 36C 36C 95C 80C
14D 36D 36D 95D 80D
14DD 36DD 36DD/E 95E 80E
14E 36E 36DDD/F 95F 80F
14F 36F 36G 95G 80G
14FF 36FF 36H 95H 80H
14G 36G 36I 95I 80I
14GG 36GG 36J 95J 80J
14H 36H 36K 95K 80K
16B 38B 38B 100B 85B
16C 38C 38C 100C 85C
16D 38D 38D 100D 85D
16DD 38DD 38DD/E 100E 85E
16E 38E 38DDD/F 100F 85F
16F 38F 38G 100G 85G
16FF 38FF 38H 100H 85H
16G 38G 38I 100I 85I
16GG 38GG 38J 100J 85J
16H 38H 38K 100K 85K
18B 40B 40B 105B 90B
18C 40C 40C 105C 90C
18D 40D 40D 105D 90D
18DD 40DD 40DD/E 105E 90E
18E 40E 40DDD/F 105F 90F
18F 40F 40G 105G 90G
18FF 40FF 40H 105H 90H
18G 40G 40I 105I 90I
18GG 40GG 40J 105J 90J
18H 40H 40K 105K 90K
20B 42B 42B 110B 95B
20C 42C 42C 110C 95C
20D 42D 42D 110D 95D
20DD 42DD 42DD/E 110E 95E
20E 42E 42DDD/E 110F 95F
20F 42F 42G 110G 95G
20FF 42FF 42H 110H 95H
20G 42G 42I 110I 95I
20GG 42GG 42J 110J 95J
20H 42H 42K 110K 95K
22B 44B 44B 115B 100B
22C 44C 44C 115C 100C
22D 44D 44D 115D 100D
22DD 44DD 44DD/E 115E 100E
22E 44E 44DDD/F 115F 100F
22F 44F 44G 115G 100G
22FF 44FF 44H 115H 100H
22G 44G 44I 115I 100I
22GG 44GG 44J 115J 100J
22H 44H 44K 115K 100K


For more info about how our DD+ bras fit compared to similar styles in other brands, please visit our blog 

For help with sister sizing, click here.

Lingerie & Clothing

6 2 34 6
8 4 36 8
10 6 38 10
12 8 40 12
14 10 42 14
16 12 44 16
18 14 46 18
20 16 48 20
22 18 50 22
24 20 52 24
26 22 54 26
28 24 56 28
30 26 58 30


Body Measurements

AU Size Hips (CM) Waist (CM) Bust (CM) Hips (IN) Waist (IN) Bust (IN)
6 86.5 62.5 80.5 35 25.5 33
8 89 65 83 36 26.5 34
10 94 70 88 38 28.5 36
12 99 75 93 40 30.5 38
14 104 80 98 42 32.5 40
16 109 85 103 44 34.5 42
18 116 92 111 45.7 36.3 43.7
20 123 99 118 48.5 39 46.5
22 130 106 125 51.2 41.8 49.3
24 137 113 132 54 44.5 52
26 144 120 139 56.7 47.2 54.7
28 151 127 146 59.4 50 57.5
30 158 134 153 62 53 60