Looking For A Designer Crochet Aviator Hat To Make? Presenting, 'A1 Aviator Hat'. With This Easy Crochet Pattern, You Can Design This One Of Its Kind Aviator Style Hat That Resembles A Real Pilot Hat. Take Off Your Flight Of Imagination And Go Vrooooooom! ;) Although, the picture showcases a baby wearing the aviator hat, yet I have included all the sizes from newborn to adults in the pattern. If you need any help during the making of this pattern, I will be glad to assist you in any manner. Skill Level: Easy Suggested Yarns: Ironstone Yarns Harmony. 3 colors. Berroco Vintage Chunky. 1 color. Crochet hook size: 6.5 mm(K) or size needed to obtain gauge. Finished circumference sizes in inches: 14-16, 16-18, 18-20, 20-22. Abbreviations: US terms Pattern language: English