Mad Hatter Congresswoman Frederica Wilson -- Pharrell's Got NOTHIN' On Me

Congresswoman Frederica Wilson (known for her wacky headpiece collection) isn't worried about a little competition ... telling TMZ, Pharrell better step up his hat game after the Grammys if he wants to play with the big dogs.

Frederica was out in D.C. Monday when we asked about the insane hat Pharrell wore at the Grammys Sunday night ... and frankly, she wasn't impressed.

She talks some big talk too ... and not just about Pharrell ... Frederica unloads on Congress for not letting her wear her hats inside.