On another thread, I wrote: "Of course, Superman has always worn other outfits during his storied career (as the Man of Steel and as Clark Kent—and in other guises). This would be a worthwhile thread, looking back on all the fashion choices over the 80 years."
As no one else took up my suggestion, I decided to start the topic myself. I think there's no end to the fashion choices we've seen from the Man of Tomorrow.
Everyone knows this is what Superman and his mild mannered alter ego were wearing in their first appearance--
--for ACTION COMICS No. 1 (June 1938).
And here is "Superman's New Uniform," twenty years later--
--from ACTION COMICS No. 236 (January 1958).
Then there was the time when Clark was Jim White and dressed like so--
--in SUPERMAN No. 165 (November 1963), "The Sweetheart Superman Forgot."