I finished my first sweater just in time for fall/winter!! The mountains are based on a cross stitch pattern (info in comments) but other than that I totally winged it! The waistcoat
Waistcoat Stitch Tutorial — Meghan Makes Do
Pattern: The Snow Cone Beanie - Evelyn And Peter Crochet
How to Crochet the Waistcoat Stitch or Knit Stitch – Step-by-Step Tutorial
How to Crochet the Waistcoat Stitch or Knit Stitch – Step-by-Step Tutorial
How to Crochet Waistcoat Stitch: Video and Photo Tutorial
Center Single Crochet AKA Waistcoat Stitch - moogly
Waistcoat Crochet Hat Tutorial - Beginner Friendly - Melanie Ham