You should measure for bra size once a year.

If you have recently gained or lost weight you need to measure your bra size.

Pregnant and nursing mothers should measure more often as normal pregnancy and post-pregnancy changes occur.

Step 1: Band Size

While wearing a bra measure around your rib cage, right under the bustline.

Add 5 inches to an odd number and 4 inches to an even number.

Example:

Band Sizes:

1. Measurement is 29" then 29" + 5" = 34" so your Band Size = 34"
2. Measurement is 34" then 34" + 4" = 38" so Band Size = 38"

Step 2: Cup Size

Measure over the fullest part of the bust line. Subtract your band measurement from this measurement. If the difference is 1" your cup size is A, 2" difference is cup size B, 3" difference is cup size C, 4" difference is cup size D, 5" difference is cup size DD.

Example:

Cup Sizes:

1. Measurement is 36" then 36" - 34" =2" so Cup Size is B
2. Measurement is 41"then 41" - 38" =3" so Cup Size is C