1" won't cut it. I've tried to cut down my ASAT beanie. It still hits it.
I don't need "much". I've got a Predator fleece stocking cap, and it's enough "shade" over my eyes to cut the glare, in the evenings. I do have the wolfsking beanie from Jeff @ GWW that I'll probably just have the velcro added to.
I used to shoot with a cant. Now, I just "can't" (pun kinda intended). It just feels really weird to cant my bow, now.