I am presentable when traveling in coach. (clean conservative slacks/shirt or conservative shorts/shirt in warm weather). When I travel in intl biz/F & domestic F, I usually dress up more. Since I don't travel for biz, I don't usually wear suits. When I traveled for job interviews in the 1980s/early 90's, I usually wore a suit when flying. Especially if the interviewers are meeting me at the arriving airport!

One thing I wish the US airports have are showers! I feel guilty not having showered for many hours and most of the connecting airports in the US do not have showers that the public can use for low cost/free. Some of the overseas airports I'd been to (SYD, MEL, etc) have either free/low cost showers. It is nice to use these facilities when connecting and/or arriving.

Since I have at least mid/top status on a few airlines, alot of the lounges (especially overseas) have showers and it is very nice. Presently, I don't have to do a limited body cleanup in the airplane's lav very often due to alot of lounge access I have now.

I am tolerant of a slightly "smelly" person that have travelled 12-24 hrs in a airplane to the US arrival point & having to connect in a US airport where there are no public shower facilites. I am less tolerant of someone who started in the US that didn't have a shower & could have taken a shower.

I do my best not to be in anyone's way & let the F/A's do their job.