Hahahaha! You so funny! The mainline, sorry LEGACY, guys and gals I see most often look sooooo professional in their windbreaker jackets, no hats, and backpacks!
I can say with 100% honesty that I have never seen an AA guy with a back pack. Not once. That doesn't mean it doesn't happen, but it is very scarce. Windbreaker? Never. Hats are now optional at AA, which is a good thing.
I haven't seen
that many regional guys looking crappy, either. There's a few; bad apple syndrome. Usually, it's the shoes and hair that stand out as being inappropriate.