These are very popular with my students (from 6th grade down). Our classrooms tend to be cold and at the beginning of the year kids are freezing. These are loaner sweatshirts that are available on a "first asked, first come" basis. I bought them in adult large and have no problem if the kids stretch them out over their knees. I've never had any "fighting" over them and with my name so prominently displayed both front and back they never move to a different classroom (if the child wearing it forgets usually another child reminds them). I take them home every two weeks to wash and...KNOCK ON WOOD....I've never had a problem with lice :)
I'd like to take credit for this idea but it was something I had read in a magazine years ago that stuck with me.