LOL yes, I did this instead of working on page 6 of Madland.
Basically the thought process behind this was: when the Avatar becomes fully realized, Aang's gonna need to represent all four nations in his dress style, so I'd better design him some clothings. I was going to create a style that encompassed all four nations, but it's getting late, and I'm lazy. YES I HAVE TOO MUCH FREE TIME
I know he technically already had a Fire Nation outfit, but well.. yeah, I wasn't a big fan of that one. It looked kinda...stolen. Plus, the headband was necessary to pull off that look, and hair made Aang look like that kid from Wonder Years.