Grace Akhrem Patterns - Nicole is a similar pattern: 20 (5 sts. / inch) finished gauge, hats and more garment, for women, and worsted (19-20 sts/4 in) yarn gauge. You may also like Swans Island Patterns - Sebago Hat, which is another similar pattern: hats and more garment, for women, worsted (19-20 sts/4 in) yarn gauge, and 210 yarn yardage.
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!