11. What to Wear to Prom
Cost: $300–$700 (actual dress price)
Created by: Shirley Hill
Acquired via Independent vendor
We couldn't compile a list of the worst mistakes made when purchasing online without mentioning all the embarrassing prom dress mishaps. Some girls buy their prom dresses online or from unscrupulous third-party retailers every year, almost like clockwork. The outcome is both terrible and humorous.

Prom Dress: Twitter.com / @marrahaley
When @marrahaley, a Twitter user, ordered her prom outfit online, she discovered that information. Designer Sherri Hill's intended sleek, fishtail dress turned out to be much too big and covered in tacky faux pearls rather than real needlework. "This is what happens when you order online," as @marrahaley stated.