Criminals never seem to think about this . . . but in case you get caught and need to take a mugshot, put some thought into what you wear.  30-year-old Matthew Coleman of Friendswood, Texas did NOT.


On Tuesday, Matthew was busted for theft . . . while wearing a FULL BODY COOKIE MONSTER ONESIE. 


It would be perfect if he'd been busted for stealing cookies . . . but we're not THAT lucky.  He was stealing stuff from a construction site with a friend.


The friend was 23-year-old Dean Stevens, who had the good sense not to dress as a "Sesame Street" character.


But they were both arrested for theft