The Sound Reactive Nightgown uses Flexinol, a shape-memory alloy that returns to its original form when it is stimulated. If you yell or speak loudly in the vicinity of this item of apparel, it starts lifting up the hem.
(Sound Reactive Nightgown video)
Fans of JG Ballard recall the fashions of Vermillion Sands, made from bio-fabrics that react to the emotions and moods and noise-level of those nearby:
The racks of gowns itched and quivered, their colors running into blurred pools. One drawback of bio-fabrics is their extreme sensitivity. Bred originally from the gene stocks of delicate wisterias and mimosas, the woven yard have brought with them something of the vine's remarkable response to atmosphere and touch. The sudden movement of someone nearby, let alone of the wearer, brings an immediate reply from the nerve-like tissues. A dress can change its color and texture in a few seconds, becoming more decollete at the approach of an eager admirer, more formal at a chance meeting with a bank manager.
Superomniphobic Fabrics Are Super Clean
'Most gentlemen's and ladies' gloves nowadays were constructed of infinitesimal fabricules that knew how to eject dirt...'- Neal Stephenson, 1995
Smart Bra From First Warning Systems
'...a delicate current is sent ... to an amplifier and a certain sound is made, and the nurse will properly react...'- David H. Keller, 1928.
Technovelgy (that's tech-novel-gee!)
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Sky City's 220 Stories Are Go
'It rested among green parklands and... stood in total isolation, a glittering block of whites and flashing windows dotted with colors.'
Robo-Raven Flapping Wing Robot Bird
'When he had first built them, they had been crude indeed, flying mechanisms with little more than a reflex-response unit.'