Knowing the place and time of your wedding will help focus your search. Will you be having a daytime ceremony on the beach? You can rule out ball gowns with long trains and dramatic embellishments. Exchanging vows in a candlelit cathedral? Avoid short slip dresses or anything that looks like it could be worn to a cocktail party. Most fabrics are suitable year-round, but some, like linen and organdy, are more appropriate for warm weather, while velvet and brocade are best left for winter.