I wear play clothes just like the kids are supposed to. Mostly it is stretchy pull on pants but not as tight as yoga style. I just wear a tshirt on the top. I have two sweatshirts I pull on and off as the temp feels cold or they get in the way cooking. For shoes I have slip on canvas ones - I like those because they are as comfy as slippers but have the rubber grip soles so safer carrying kids around.

All clothes have to be wash and wear no iron and occasionally the tshirts get into the bleach depending on what is on them or who has been sick and snotted on me.

Hair is brushed but nothing fancy and I don't wear makeup so not an issue.

Mostly it is about looking like you are ready for the day and competent/excited about the kids there. What you wear needs to be comfortable, allow for freedom of movement since you will be bending down a lot and twisting, be free of things that would bother kids like lacy collars aren't great for a baby trying to snuggle or low droopy tops don't usually stay in place as a kid tugs on you trying to get picked up.