Quick and easy crochet pattern! This adorable aviator hat is oh-so-easy to crochet, so it is perfect for the beginning crocheter. Adorable Aviator Hat for both boys and girls! #4 Worsted weight yarn and #5 Bulky furry yarn makes a cute hat for your little aviator! This hat works up quickly and is sized from Newborn to 10+ years. Warm winter hat OR fun photography prop! FINISHED SIZES listed in CROCHET PATTERN: Newborn measures 14" (35.5 cm) 3-6 months measures 15-3/4" (40cm) 6-12 months measures 17-1/4" (43.8 cm) 2-3 years measures 19" (48.25 cm) 4-10+ years measures 20-1/2" (52 cm) You must be familiar with basic crochet stitches and techniques. My instructions are very well written and very easy to follow!