The corset looms large in special exhibitions at both the de Young and the Legion of Honor. Jean Paul Gaultier, the subject of the de Young's The Fashion World of Jean Paul Gaultier: From the Sidewalk to the Catwalk , integrated this iconic garment into his prêt-à-porter collections as early as 1983. Meanwhile, over at the Legion of Honor in The Cult of Beauty: The Victorian Avant-Garde, 1860 –1900 (on view through June 17) the artists of the Aesthetic Movement rejected the corset in…