Washington Redskins star Chris Baker knows the key to winning over a crowd -- BIG MAN BELLY DANCE!!

Baker -- a seasoned vet at the Becky's Fund charity fashion show in D.C. -- decided to show some skin his 4th time around, and he somehow managed to outdo himself AGAIN this past weekend.

The event -- which raises money to fight domestic abuse -- also featured Wizards stars Kelly Oubre and Otto Porter and Baker's teammates, Pierre Garcon and Vernon Davis ... but Baker is clearly the star of the show.