This is my wife and I at a 70's, disco-themed party over the weekend. Did everyone in the 70's dress like this when they went to a club?
Yes. Big hair. Big mustache. Fluffy chest hair. According to Amazon (where we bought our costumes), this is how we dressed.
Of course, I was around 10 when swingin' singles were heading out to the discotech, so I was wearing my Fonzie pajamas. But if I were 10 years older, it's obvious I would have looked groovy.