"Oh um..." Bart trailed off , thinking about this for a minute. "Well, I kind of.... got mine from someone else." And Bart wasn't about to tell Wally that someone had complimented Wally's style in costumes. "Um... I dunno. You could have a cape? I don't have a cape. It'd get in the way."
Really, Bart knew next to nothing about fashion and even less about superhero fashion.
"Goggles are cool though! I used to wear goggles. And it's good to have your hair out. Cause otherwise you look like a dork."