70s Top Hat Dumb & Dumber Hat Dumb And Dumber Costume Hat 27099 Coachman Colored Top Hat. PLEASE NOTE HAT HAS SLIGHT TAPER IN CROWN FROM BOTTOM TO TOP Hat has a 6.5" crown, 1.75" brim and approximate size is 7 5/8. this is and adult size hat Made from pressed permafelt. This is a costume hat. Works well for Dumb & Dumber hat. Hat has a 6.5" crown, 1.75" brim and approximate size is 7 5/8. Made from pressed Permafelt this is a costume hat. Works well for Dumb & Dumber hat. PLEASE NOTE HAT HAS SLIGHT TAPER IN CROWN FROM BOTTOM TO TOP