I followed this pattern, only my hat came out more rounded, than triangular. ( I think i missed the chain twos at the end when i was going around…ooops!), but in the end I came up with something that still works, and used up some of scrap yarn while at it!
I started with making the band first, using a ribbing stitch until it was 18 inches long.
Then I crocheted half double crochets all around, switching colors after each row, until it was time to decrease.
I decreased my stitches, as the pattern told me to until I got to the point that my hat was too tight to flip in and out and I made a big pom pom to put at the top.