We are here to help you find your perfect fit as we know how good a perfect fitting bra feels
Help find your perfect Playful fit
Learn about and find your sister size
Watch a video to see how our bras compare in fit to other well known brands
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How to work out your Playful Promises bra size using a tape measure
Step 1
Step 2
Step 1
Step 1: Measure your under band.
Step 2: Measure your over bust. Use a non padded bra to lift breasts into place and then
measure the fullest part of the bust. The difference between your band size and over bust measurement will
determine the cup size.
Underband:
Inches:
Centimetres:
Overbust:
Inches:
Centimetres:
Step 2
Learn more about how we work out your size
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Shop my bra size
Learn about sister sizes
Think about your favourite bra, what size is this? Don't worry if it's not the perfect fit as we'll work on that next
What bra size do you normally wear?
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Thanks for sharing your band size. How does the band feel against your skin?
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Next let’s make sure the cup size is going to be right for you
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Shop my bra size
Learn about sister sizes
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This video shows how our brand fits compared to other leading brands. This is to help inspire confidence that when you shop with us you are ordering the right size.
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Sizing Systems:
We use the traditional plus four or five inches system. A lot of fuller bust companies
add no inches or 2 inches only rather than the plus four or five. This is really a matter
of preference of the company making the product as the actual physical size of the bra
will be the same just the size it is called will vary. So for example someone who is
a 30H in a brand that uses the newer system would be a 34F in our system. However the
actual bras would be similarly proportioned and it is not that you are truly one size or the other.
Neither system is right or wrong but as a customer it is key to know what system the company
you are buying from is using so that you get a bra that physically fits you.
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What is Sister Sizing?
Sister size is a size where the cup volume stays the same despite the band and cup number changing – this is
why if for example your bra size is 34C but it is out of stock you could try a 32D or 36B as the cup is made
from the same size patterns pieces and uses the same size bra wires – it is just the band which is a
different length. As the bra will have 3 rows of hooks and eyes on the end of the band it can
often work on the tightest if you size up or on the loosest or with a bra extender if you size down. Use
this handy chart to find your two sister sizes. We recommend you don't go up or down more than one either
side though as then the band would be to tight or loose
Click any sizes from this table and click go and it will show you what perfectly playful styles we have in your size in our shop
30A
30B
32A
30C
32B
34A
30D
32C
34B
36A
30DD/E
32D
34C
36B
38A
30DDD/F
32DD/E
34D
36C
38B
40A
30G
32DDD/F
34DD/E
36D
38C
40B
42A
30H
32G
34DDD/F
36DD/E
38D
40C
42B
44A
30I
32H
34G
36DDD/F
38DD/E
40D
42C
44B
30J
32I
34H
36G
38DDD/F
40DD/E
42D
44C
30K
32J
34I
36H
38G
40DDD/F
42DD/E
44D
32K
34J
36I
38H
40G
42DDD/F
44DD/E
34K
36J
38I
40H
42G
44DDD/F
36K
38J
40I
42H
44G
38K
40J
42I
44H
40K
42J
44I
42K
44J
44K
GO
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Sister Sizing De-Mystified!
January 20, 2021
What’s Sister Sizing you ask? Well, it’s the answer to (some) of your bra troubles. And it’s easier than you think! Armed with this knowledge, you’ll be able to find even more bras to fit you. Sound good? Let’s start!
In order to find your sister size, all you need to do is take your bra size and either:
Add a cup size, minus a band size
OR
Add a band size, minus a cup size
So if you’re a 34F, you can either try a 32FF, or a 36E.
Still confused? Don’t worry!
The reason why you can do this is because by following this formula, the underwire length is the same, as well as the neck edge. The only thing that changes is the length of the underband. Luckily, all our bras come with at least 3 sets of hook and eyes so you can adjust the band to fit you better.
To make things even simpler, we’ve made a chart so you can easily find your sister size. All you need to do is find your bra size, and look along the same row to see which sister size will be a suitable fit. We don’t recommend going any more than 1 size up or down however, as the band will be too loose or too tight!
We want your Playful Promises purchases to fit perfectly. Please see our guide below for measuring and sizing information. This website is in US sizing.