Reva Mivasagar   New York Magazine Pick   The Collection: Modern, non-fussy, but romantic. Floaty bias-cut fabrics, sheaths, and soft A-line dresses are perfect for the less traditional, fashion-forward bride.   The Gown: Bias silk-crêpe gown with chiffon overlay.   The Price: $2,750.   Where to Buy: Gowns range from $2,500 to $9,000 and can be purchased at Reva Mivasagar, Bergdorf Goodman, and Kleinfeld.