Why are the cup sizes not normal letters?

A fair question and we wrote this page to explain.  The bras we import all come from Poland and Some of those brands (but not all) don’t follow the standard difference between UK Cup sizes of 1 inch, instead they have a difference of 2cm.  This means instead of being able to directly line up with the sizes you may wear with other brands we have to do a conversion, this means some sit between UK sizes and this is where our “F/FF” and similar sizes come in.

How can I work out which size I need?

The “Size Range” is the number of inches over your bust and converts like this

Normal UK Size UK Cup Size

in Inches

Which size to try?

Select this on the filter

Possible Polish Cup Letter
A 1 May not be available
B 2 May not be available
C 3 May not be available
D 4 D-DD (overbust 4.7″-5.5″ ) A
DD 5 D-DD (overbust 4.7″-5.5″ ) OR
DD-E (overbust 5.5″-6.6″ )
A OR B
E 6 DD-E (overbust 5.5″-6.6″ ) OR
E-F (overbust 6.6″-7.1″)
B OR C
F 7 E-F (overbust 6.6″-7.1″) OR
F-FF (overbust 7.1″-7.9″ )
C OR D
FF 8 FF (overbust 7.9″-8.6″ ) OR
FF-G (overbust 8.6″-9.4″ )
E or F
G 9 FF-G (overbust 8.6″-9.4″ ) OR
G-GG (overbust 9.4″-10.2″ )
F OR G
GG 10 G-GG (overbust 9.4″-10.2″ ) OR
GG-H (overbust 10.2″-11″ )
G OR H
H 11 H-HH (overbust 11″-11.8″ ) i
HH 12 HH (overbust 11.8″-12.6″) OR
HH-J (overbust 12.6″-13.4″ )
J or K
J 13 HH-J (overbust 12.6″-13.4″ ) OR
J-JJ (overbust 13.4″-14.2″)
K OR L
JJ 14 J-JJ (overbust 13.4″-14.2″) OR
JJ-K (overbust 14.2″ – 15″)
L OR M
K 15 K (overbust 15″ – 15.7″) OR
K-KK (overbust 15.7″ – 16.5″)
N OR O
KK 16 K-KK (overbust 15.7″ – 16.5″) OR
KK-L (overbust 16.5″ – 17.3″)
O OR P
L 17 KK-L (overbust 16.5″ – 17.3″) OR
L-LL (overbust 17.3″ – 18.1″)
P OR R
LL 18 LL-M (overbust 18.1″ – 18.9″ S
M 19 LL-M (overbust 18.1″ – 18.9″ S


Please Note : The Polish cup letter column is the most common correlated cup letter, and may vary brand to brand.  The letter on the label of the bra you receive will be the Manufacturer’s letter NOT the UK Size (even if it suggests it is one and the same.

Most of our brands thankfully follow similar maths, but we have added to each product page a table showing you the conversion, like this :

Gaia Cup Letter Gaia Size Range (cm) Gaia Size Range (“) Approx. UK Cup Range
A 12 – 14cm 4.7″-5.5″ D-DD
B 14-16cm 5.5″-6.6″ DD-E
C 16-18cm 6.6″-7.1″ E-F
D 18-20cm 7.1″-7.9″ F-FF
E 20-22cm 7.9″-8.6″ FF
F 22-24cm 8.6″-9.4″ FF-G
G 24-26cm 9.4″-10.2″ G-GG
H 26-28cm 10.2″-11″ GG-H
I 28-30cm 11″-11.8″ H-HH
J 30-32cm 11.8″-12.6″ HH
K 32-34cm 12.6″-13.4″ HH-J
L 34-36cm 13.4″-14.2″ J-JJ