A falling bra strap may be cute in the bedroom, but in the boardroom? Not so much. Shoulder shape is often the culprit, as women with narrow or downward-sloping shoulders often report that their bra straps won’t stay put, even when the straps are properly tightened. Lucky for petite-shouldered women, the solution involves an excuse to go shopping! U-back style bras prevent slipping because they generally have narrower-set straps and the additional coverage (compared to a bra with a traditional back) creates a more secure fit to the body.