I've been experimenting with some of these cute types of hats. The fist time I was one was on a you-tube video from the giant robot project, and I knew I had to make one.
I can't seem to get over my love of cubes... tho this hat came out a bit smaller than I wanted so I guess I'll have to remake it... : D
I've done these hats with no increasing or decreasing at all, just sewn together at the top. I may try some shaping somewhere and see what happens.. Fun!