There are slings down the side of the cups that hold the wearer's breasts securely to minimise movement. How can you measure volume with a straight line? It's a niche academic field, but there is a team of researchers studying how much breasts of varying size move during activity and how trajectory changes with different types of exercise. It creates a lot of confusion when we're designing breast enlargements. The underband and shoulder straps are modular, so that some parts stretch while others don't, to create an excellent fit. Of course bigger doesn't always mean natural, but that does seem to be a requisite now. But trained fitters can now be found in almost every lingerie department; instead of relying on water or tape they add an element of mystique to this already complicated process.
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