I bought this for my teenage nephew.  We have been paying him to pick up my kids from school and swim team everyday.  It is a great costume hat and looks just like what it is intended to be. It really cracked him up and the kids he is chauffeuring. It adjusts to his size without a problem.  It expands to big enough to even fit my huge 7 3/4 inch noggan, but my 9 year old son wears it pulling his little sister in a wagon he tied to his bike.  If you want a costumy hat that is fully adjustable, this is your hat.