Open to suggestions here.

So the group I'm going to see Avengers with has decided we should dress up. Which leaves me, the only girl in the group, with few options. So any ideas on a Natasha\Black Widow costume I might be able to accomplish by the 4th? Thus far all I have in my head is black, and tight. And dying my hair a reddish color. Ack. Stupid boys who want excuses to wear their arch reactor shirts.