this is my ideal but I've left it far too late to 'chance' China post!
I am wearing my hair in a high bun so actually, my hat shape will be more of a crescent (or croissant!) than a circle, with the worry that it'll look like my bun is being attacked by a giant felt slug......
I am using foam as a former and I anticipate many, many tries before I make one I don't throw across the room in despair.. 