I wear the same thing I wear all the time: Jeans, tee shirts, and saddle
shoes!. Albeit, I work at a very casual school and we can wear what we want.
I am the type of teacher that gets "in" there with the kids. When I leave
each day, I have paint in my hair and charcoal on my face. Nice clothes would
look dismal soon after one wearing.
Also the school at which I work is for severely emotionally disturbed kids.
It would be very difficult to duck and run when one of my kids throws a chair
at me if I were to wear heels or for that matter, a skirt.