Grand Ballgowns

A daring, backless top and a skirt with yards of luxe fabric strike a delicate balance between sultry and sweet. Ivory taffeta backless balloon-skirt ball gown with flower detail, $6,000, by Amsale Blue Label, 800-765-0170. Gold heart necklace, $4,550, by Vera Wang Fine Jewelry, 866-360-8372. Gold, pearl and box-chain necklace, $1,450, by David Yurman.