Definitely some teachers wore clothing that was quite plain and little to no makeup. Since teachers are 'on stage', the way they physically present themselves is something the kids are quite aware of and talk about - and it is reflected in their conscious and subconscious behavior. My students usually complimented me when I took care with my appearance, and asked if I was sick and even acted up more if my appearance didn't show I cared about the way I was presenting to them. Sometimes, especially when I started to get sick, I was too tired to bother regardless.
It's definitely a chicken-or-egg thing there, though. Our math dept head was a gentleman, but he came in to work every day in a shirt-and-tie and dress slacks if not a full suit. His formality showed that he respected the position and expected the kids to, and they respected him for that. I would say the same is true for female teachers, only, as previously mentioned, looking 'put together' is more of an effort. But do people who put more effort into how they present also just put more effort into their teaching? Like, is 'put together' a personality type?
I also want to say that there is always one teacher who powers through on sheer force of personality. Our health teacher, also a coach, often came in wearing sweats and a tee shirt if she was going to be practicing or walking the track; but she also always had a touch of makeup on and her hair carefully done no matter what. And she was a veteran teacher with a way with the kids and a strong, indomitable personality, so her persona compensated for the casual attire in a non-casual work environment.
-J