SweetGeorgia Patterns - Tumbler Ridge Hat is a similar pattern: 18 (4.5 sts. / inch) finished gauge, worsted (19-20 sts/4 in) yarn gauge, and worsted weight suggested yarn. You may also like Corrina Ferguson Patterns - Creedence, which is another similar pattern: worsted (19-20 sts/4 in) yarn gauge, on size US 8 US needles, and worsted weight suggested yarn.
You may enjoy taking a look at the Knitwhits Freia Sport Greensleeves Shrug, Knitwhits Freia Lace Lina Shirt, Knitwhits Freia Sport Undine Cowl, and Knitwhits Freia Lace Sonoma Shawl kits all using KnitWhits Patterns.
Hopefully our suggested yarn options for Viatrix Slouchy Hat can help you come up with your next exciting new project idea!