I never wore make up in my life other than when in costume.

My skin is thankful for it, too, I think.
I don't usually care how I look. I have sensory issues as many on the autism spectrum do, and I need to be comfortable. Especially when meeting people. I don't have a large choice of clothes either as it is hard to find something that's my size and not bothering me (material, cut, colors etc). I can't wear shoes or socks either and only wear sandals save in the deepest snow thanks to edemas. Gets me a few weird looks in colder weather.
I found at least half of my players in two of the groups have the same problems, husband included.
Yes, our society sucks in the way it cares about appearance, but at least the nerdier activities in this world should ignore that. There are other reasons for people not to need to care about how they look than supposed low self esteem or sloppiness. And I'm in anyone's face who dares to comment on my choice of attire if I happen to hear them. They are usually terribly embarrassed about it.
I insist on cleanliness and politeness with my groups and prefer non-smokers, but I don't care at all how people look other than that their clothes should fit and not expose too much of their anatomy, be that belly free on purpose or shirt too short
I also found that after a few sessions, people who first came in different clothes find it relaxing to dress like everyone else and not to care at all. With the exceptions of a few girls and one of the young men (who actually does show up in a suit but he has a reason for it).
It is possible that it has helped to put requirements like cleanliness, no smoking, no shouting in the house etc on the recruitment info. I have only once had to turn someone away for looking like he had fallen into a pot of grease or something. Of course, if that is the type of people who tend to show up I'd not want to game with them either.