Sure, nothing that isn’t made of Kryptonite can pierce his skin, but haven’t you ever wondered how his costume survives walking through fire, hail of bullets, etc. ? Maybe he needs armored boots so he doesn’t have to replace them constantly.
I seem to remember that he made it out of the blanket he was wrapped up in as a baby when he was launched from Krypton?
The jeans would burn off the first time he flew really fast! Lex Luther would only laugh when he showed up.
Freegards