The "F*** Dallas" shirt George Kittle wore during the Niners' tilt against the Cowboys over the weekend will reportedly cost the tight end a pretty penny.
According to ESPN's Jeremy Fowler, the NFL fined the San Francisco star $13,699 ... calling the under-tee he rocked during the Sunday Night Football blowout "abusive language."
The league has not yet publicly released details regarding the punishment.
Of course, Kittle can certainly afford the fine ... he's in the middle of a five-year, $75 million deal. Although based on the interviews he's done this week regarding the shirt, it seems he wouldn't have cared either way.