What the experts know about the proper bra fit
"Changing your band size can change the
underwire diameter. It is also a fact that the same size underwire
is used in different cup sizes."
Underwires and the Proper Bra Fit
Every woman who wears underwire bras needs to understand underwire sizing. Breasts have a diameter and a projection. When you select
a cup size (e.g. B, DD etc.) you are making a breast projection selection.
Finding Your Underwire Size:
Underwire shapes can vary among brands. In fact, lingerie manufacturers claim their underwire grading and shaping to be the secret behind their unique fit. This is why you may find wire variations among manufacturers. This is also why one manufacturer may fit you better than another. Underwires also have different lengths - though their curve will maintain the same shape. For example, demi cup and low-plunge bra styles will have shorter wires. Underwires in petite bras will also be shorter in length to accommodate a shorter torso. Strapless bras tend to have the longest underwires. Since they do not have the benefit of strap support, strapless bras compensate by having more wire surrounding the breast to give more support.
Keep reading. Next section: What the Experts Know About Bra Fit - How Panels, Backs, and Bands Affect Fit