“The topless hat has earflaps and ties that can be functional or just left to dangle. The mittens have a thumb slot so they’ll stay in place” - One-Skein Wonders: 101 Yarn-Shop Favorites

Size
Hat: 22” (56 cm) circumference
Fingerless Mittens: 7” (18 cm) long, 8” (20.5 cm) around

Gauge
8.5-9 half double crochet = 4” (10 cm)