I suppose it depends on the class. A math teacher would just be dressed in the vicinity of a student.  PhyEd might be more like a thong one piece swimsuit.  Then we get into the more adventurous classes, Oral she might be wearing nothing more than panties and a see though plastic apron.  I suppose what im saying is as long as you can make it fun for everyone and work in the story im game. but if you question it, just check with me.