PITTSBURGH (CBS) — Chick-fil-A is offering customers free chicken Tuesday, but there’s a catch.

To get the freebies, you must dress up as a cow.

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The deal comes as part of the 15th annual Cow Appreciation Day celebrations.

Adult customers who dress up in any type of cow attire will be rewarded with a free Chick-fil-A entrée, including the Egg White Grill or classic Chicken Biscuit during breakfast hours, or the Original Chicken Sandwich or Grilled Nuggets during lunch and dinner hours.

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Children can receive a free breakfast entrée during breakfast hours or free Kid’s Meal during lunch and dinner hours for dressing in a cow costume.

The celebration runs from the time the restaurant opens through 7 p.m.

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For a full list of redeemable menu items or cow costume inspiration, click here.