Big Mandalorian fan/with big head

Well I have been a fan since a kid, and always wanted to be the man who brought criminals to justice.So now grown up and with my own kids who love to go to Cons and the like now I wanted to participate and bought a bucket for myself. Well comes in and wow way to small.Help what should I have done to avoid this problem again.:facepalm

Which helmet did you buy? and from where?

That would help us to help you. There is a myriad of makers and helmets and then you have to deal with recasters of some of the helmets which sometimes loose size.

One way to avoid this problem again is to read, read, read and read some more on sites like this and others to educate yourself on the differences to each helmet. Also decide on what your goal is going to be. Do you want perfection screen accuracy or do you want something that fits you well and allows you to troop.