I made a reversible welder's cap for my daughter to wear under her hardhat. The pattern can be found at ricochetandaway.blogspot.com. The printable pattern has a nifty scale printed on it with
Sew a Welders Cap : 17 Steps (with Pictures) - Instructables
7 1/2 PDF Welding Cap Pattern - Etsy
Pin by Annie Sim on costume | Welder cap, Welding cap pattern, Cap patterns
Welder Cap Sewing Pattern 5 sizes And Video Instructions, Ea - Inspire Uplift