Teacher’s aides at the school where I teach used to be able to wear nursing scrubs to school.  Some of them might have to change diapers, feed students, etc., and it made sense to wear them.  Scrubs can be found everywhere from online at such places as plus size scrubs for women and even at grocery stores.  I’ve seen them a lot of different places.  The great thing about scrubs is that they are inexpensive, comfortable, and come in a large variety of prints.