When Krillin isn't getting beatten up while Goku saves the world, he's just a regular guy, wearing regular clothes, doing regular things.
I'm sure you're wondering, "But why does he have hair?!"
Goku: So, what's with the hair, Krillin? I thought you were naturally bald.
Krillin: Oh no, I just kept it well waxed. I could have sworn I told you that.
Goku: Then why did you stop doing it? I mean, you just don't look like, you know, Krillin anymore!
Krillin: I guess love makes you change some things...