Band Size
Add the full bust and underbust together in inches then divide by two.
This is your band size. (eg. size 36 or 38) If you are between sizes,
adjust to the nearest increment.
Cup Size
By subtracting the band size from the full bust you have your cup size.
if the difference is 1” you are an A cup,
if it is 2” you are a B cup
if it is 3” you are a C cup
if it is 4” you are a D cup
if it is 5” you are an E cup