IF the Man of Steel needed a sweater, it would have been crocheted on Krypton by his mother (the wife of Jor-El, whose name I forget) of steel wool. But it seems that Supie's red and blue attire, which was fashioned from his indestructible swaddling clothes by his adoptive mother, Mrs Clark, in Smallville, was enough to protect him from the elements here on Earth.
I cannot recall any comic in which his tight clothing was ever damaged by Kryptonite. The legend as I recall was that human clothing would have been insufficiently durable for Superman, and therefore he was forced to wear the same tricolored monotard for his entire life. It always seeemed to me that a baby's swaddling clothes would have proven insufficient to provide an adult-sized garment, as well as a cape and booties (or whatever you could call those things on Superman's feet).
Wonder Woman also has had to go through life with just one change of clothing. The bullet-repelling bracelets would have been surely a plus, but I question that WW would have been at all satisfied with just one change of duds. You could even see her clothes when she piloted her famous Invisible Airplane.
