When the girls have killed Jimmy and laid him out on the table, they rip open his shirt and he has a t-shirt on, the next scene he doesn't have it on right before Nicole Kidman slaps him, and when Sandra Bullock next walks over, he has it on.
I actually made a mistake on this, it's not that he doesn't have his t-shirt on, Nicole Kidman has started to cut away his t-shirt while Sandra Bullock gets the spell book, she then slaps him and in the next shot of Jimmy, his shirt is buttoned back up, and then the next scene it is unbuttoned and his t-shirt is cut open. Sorry, watched the movie again today and found this out.