Personalized Grandpa's Garage Youth T-Shirt. Youth T-Shirt - White with an old model T says WHAT HAPPENS IN GRANDPA'S GARAGE STAYS IN GRANDPA'S GARAGE. Perfect for grandpas that love old cars. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.