To Be Mad As A Hatter! The Mad Hatter Hat is just what you need to complete your Alice in Wonderland costume. Drink tea and be mad as a hatter with this stylish mad hatter hat. One hat per package. One size fits most. Approximately 22 1/4″ circumference around inside of hat. Green velour mad hatter hat. “In this style 10/6” price tag on side of hat. Yellow hatband with red dots. We have the unique Alice in Wonderland costume accessories that your guests will notice and admire. Spice up your tea party or Mad Hatter costume with a classic mad hatter hat.