Pants-less
Wendy had worn her denim tunic without pants before, but only once or twice, and in the winter when she also wore stockings or leg-warmers, and definitely not when Eric Cartman's revolting stare was following her ass as she tried to put her books in her locker.
"Wendy, everyone knows girls should only go pants-less if they have an ass, so you can really take your anorexic butt and shove it in some 40 year old soccer mom jeans, okay? Ok-"
"I don't give a shit what you think, you fat fuck!" Wendy slammed her locker door against the door next to her's (sorry, Tweek) and tried to ignore Cartman as he leant against Tweak's locker to continue antagonizing her (Tweek was definitely going to have a dented locker door now; I'll have to be sure to blame it all on Cartmans lard-ass lying on it later).
"Wow, see, those body issues are really getting to you and warping your sense of reality, Wendy. I think the only option is to eat 10 cheeseburgers, unless you want to die a literal shriveled up old maid".
"Well I'm sure a pile of cheeseburgers is just the average between-meal snack for you, Cartman, but some people like to actually eat properly instead of deep throating McDonalds until they stroke out!"
"Oh please, ain't no flat-ass bitch telling me how to 'eat properly'-"
Her 500-page calculus textbook met with his ear with a lot of speed at that point, and Wendy managed to slam her locker door shut and spit in Cartman's direction while he was still wincing in pain on the floor, holding the side of his face. She strode off muttering under her breath before Cartman could get up while Kyle stared, hurrying over to see how Cartman was, talking incredulously into his cellphone all the while.
"Dude, I know you feel shitty but you missed out staying at home, Wendy just totalled Cartman with her tex-"
"Ugh," Stan groaned through the phone. "Kyle really, stop telling me about Wendy and Cartman's sick fighting fetish, I already threw up once this morning".