Note: For different yarn weight or if using another hook size:
Increase until flat circle diameter is 7.5 - 8 inches/19-20 cm
height of the hat 8 inches

For my original beanie I used a J Hook but I ran out of the original camo print yarn i was using witch i found a bit more fine of a yarn so I had to use:
L15 Light Camo Print medium 4 ply 100% Acrylic
I used a H - 5mm hook