I too don't wear fancy clothes. By the end of the day between being on the floor, doing crafts, or general messiness of being with infants and toddler, I am quite stained. I have issues with some of my colleagues who dress up in heals, fancy shirts, and skirts when doing daycare because they often don't play with the children and won't let the children have messy play (or even play in the sand) because it will get them or their house dirty.

I wear just plain tshirts and blue jeans in the winter and tshirts and capris in the summer. I used to wear yoga style pants in the winter and may move towards that again in the future.