In my opinion, all teachers in the elementary and middle school level should be dressed similar to students and early childhood should be the same due to the fact it is like what they see at home with their parents. They are used to that and are more comfortable that way.
In general, I dress with jeans and a plaid shirt. On hot days, I wear shorts but other than that, I wear what I would be allowed to wear in the school anyways. For me a good dress code would be