Miuccia Prada for "Atilla." Thierry Mugler for Lady Gaga. Rodarte for "Black Swan." It seems that high-end fashion designers are expanding far beyond their runways these days. So it was only befitting when the 6th Annual Divas Shop for Opera event, a charity designated to benefit the design of New York City Opera costumes, asked various designers to create sketches inspired by their favorite operas.