Washington Commanders star Brian Robinson's big hat resulted in some BIG sales for the company behind the massive lid ... 'cause TMZ Sports is told their business saw a whopping 2,000% increase in orders!!
Robinson's hat quickly went viral after Sunday's 19-13 win over the Atlanta Falcons ... and the running back hilariously told reporters -- "if you want a big hat, let me know."
Noggin Boss -- the company that sells big hats starting at $75 -- tells us the impact was immediate .