I see a lot of talk about Superman's aura protecting his clothes making them invulnerable, but where does that idea come from.
It's post chrisis pseudoscientific explanation on how the invulnerabilty works. The kryptonian dense molecular structure could only partly account for it. So his cells creates bioelectric field that require highyield nuclear blasts in order to fail.
It also explain the costume. Pre crisis it was of kryptonian origin so it was invulnerable in it's own right. It could also protect others that wore it. While carrying passengers in flight, Superman would wrap them in his cape to protect them from air friction.
In the post-Crisis comics, his costume is invulnerable because of the bioelectric field.
