Think twice before topping off your outfit with a baseball cap at the steakhouse.

The corporate owner behind the famed Ruth’s Chris Steak House is cracking down on diners, rolling out a strict dress code that bans hats at the table and requires diners to show up in “proper attire.”

Parent company Darden Restaurants, which operates 162 restaurants across the globe, warned its guests that the vibe is strictly “business casual.”