Monique Lhuillier   New York Magazine Pick   The Collection: Regal gowns with stately appeal. Gleaming white dresses feature full skirts and ornate details such as chandelier beading and obi belts and sashes.   The Gown: Silk-satin three-quarter sleeve scoop-neck gown.   The Price: $4,840.   Where to Buy: Gowns range from $2,000 to $7,000 and can be purchased at Bridal Atelier, Kleinfeld, and Wedding Salon of Manhasset.