Although this dress isn't the best fitting, or made out of fabric that looks comfortable, it has a cool background. Originally this concept was created by artist Kelsey Michelle who made some drawings of female Avenger's in formal dresses. Then Spwinkles (as she's known on Deviantart) made the dress come to life! You can see the original drawing after the jump to compare and then also wonder why she didn't make the Hulk dress instead.
Source: Fashionably Geek