1 Comment.

cf. Piezoelectrically controlled active wear, US Patent 6198204 B1, with abstract:

An article of clothing including a piezoelectric transducer and an electrical component restrains movement of a first body portion relative to a second body portion. The article of clothing can be a sports bra that controls the wearer's breast movement relative to the wearer's torso. As the breast moves, the piezoelectric transducer deforms and induces a voltage that is passed to the electrical component. The electrical component provides either a resistance or a control signal to the transducer. The transducer stiffens in response to the electrical component and reduces the movement of the breast by placing an external force on the breast.

... as cited in "A Brief History Of The Sports Bra"

– ZZzzzz 2014-07-22 02:36 UTC</div>