A New York-based Web site called Fashism.com says it wants to avoid a teen girl's nightmare -- wearing the same prom dress as someone else.

The site lets users post images of their gowns in its "Got Dibs" section, where it merges with the users' high school networks on Facebook to make sure no two classmates show up at prom in the same outfit.

Has your daughter or grandaughter already bought her dress for the prom?  What do you think of the prices of the dress that will be worn for one night?

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