I dress for the purpose and location of my trip. Typically I am dressed a bit nicer than my peers would in the same situation, but that's just me. I don't do it to look the part for premium class. I certainly don't do it with the expectation that dressing better in and of itself will fetch me a free upgrade. Plenty of jerks own nice clothes. I figured that out after a few years on my own, and I think most other adults have, too.