We all know that Superman changes in the phone booth. But where does he put his regular clothes while he's on a mission? He doesn't throw it out, because he changes back. But we don't see him carrying a bag of dirty laundry while he's on a mission.

("In his right hand, Superman has Lois Lane, and in his left hand he seems to be holding... boxers??)

And I can't imagine he leaves it in the phone booth.

So where does Superman leave his regular clothes after he changes?