It's winter guard time!!

Our theme this year is 70s and our show is called That 70s Show (like the TV show). And this year, we get to pick our own costume. Our coach told us to do "research" on 70s fashion and to watch some that 70s show episodes. I'm starting to like the 70s style, but I can't think of what my costume should be. It's a broad decade, so it's hard to pick just one costume.