http://pongogirl2.hubpages.com/hub/1970s-Fashion - Bee Gees...I believe they had the top five song positions on the charts. It got to the point that they wrote songs for other singers. John Travolta sealed the whole disco look. I personally loved the disco era.
Saturday Night Fever is defintely a movie that helped make Disco music mainstream. Tony Manero's white suit and black polyester shirt define for some the whole late 70s fashion. In my opinion it's an example but not the only look that represents the late 70s for men's fashion.