Juniper Moon Farm The Kittery Collection Patterns - Chadbourne Hat & Mittens and The Fibre Company Patterns - Stratum are both similar patterns: 18 (4.5 sts. / inch) finished gauge, hats and more garment, for women, and heavy worsted/aran (16-18 sts/4 in) yarn gauge.
You may enjoy taking a look at the Noro Kureyon Phoncible Hat, Malabrigo Rios/Madelinetosh Tosh Merino Light Howlcat! Cowl (adults), Malabrigo Worsted Chevzam! Cowl, and Malabrigo Arroyo Darla Hat kits all using Dull Roar Patterns.
Hopefully our suggested yarn options for Zam Hat can help you come up with your next exciting new project idea!