I've made the Christopher Reeve rendition of Superman have smaller pants to suit how they dressed in the 70's/80's. They some how saw a man in speedo's as masculine and he-manish but hey, whatever floats their boat.
The 1950's Superman I've done the opposite and made his pants bigger and Simon Cowell-ish, which is the way he would have worn them in that time period.
For Marlon Brando's character Jor-El I've made his outfit glow like it did in the movie because of his omnipotent persona.
Richard Pryor's character Gus would stereotypically have a pen in his pocket, being a computer programmer. And his actual persona as a comedian would stereotypically have a 'rolled up something' as Alan suggested.
Margot Kidder's character Lois Lane was a 70's character so I added the oversized 70/80's collars and added a pen and notebook as she would stereo typically be seen with this as a reporter.