A note about the shelby kaava pattern. It claims it can be used for non-strech, but you definately need to size it much bigger. Last night I made an insulated bomber hat with the pattern. I am a size large so I added a half inch seam to the xl. The xl fit tight so I used that cap for the inside. I made the pattern a half inch bigger yet (1 inch total) for the insulation and outer nylon. It fits but its very tight. I might add a spacer to make it more comfortable.
So the pattern does work, but give it a 1.5 inch extra to make an insulated hat with it.
It looks like an old school leather football helmet. I like it even though its tight.
Scott
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I had superhuman powers, but my therapist took them away.