br In the 21st century the 70s Halloween costumes is a favorite choice of outfits for those who like to dress up. For Halloween the retro look is cool; no wonder the hippie look for Halloween continues to be a popular option. When you think about big hairdo?s and go-go boots it is easy to see why 70?s Halloween costumes are a preferred style for those who like to dress up on this Holiday. Even though the 70s have long past, when Halloween comes around, you can still go retro and bring this decade back to life.