Loom Double Knit Hat
Hat will stretch to fit a range of sizes.
Uses Martha Stewart Loom with large pegs. The pattern says to use two stands of Aran weight yarn held together.
I tried it once, using the 54 working pegs as written, but it came out too small. Then I used about 3 more pegs on each side and it came out fine.
I used a single stand of Lion Brand Homespun, and it used about half a skein for each hat.