Was done on a 36 peg Knifty Knitter loom but is written in the 41 peg loom as well as the 44 and 59 peg 1/2 gauge CinDwood looms.
I used Red Heart With Love yarn with double strands, it is a sitffer yarn and works good for these big brimmed hats.
This is a fairly easy hat and includes videos for help.