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 Crochet Basket - All About Ami
How To Crochet the Waistcoat Stitch (Knit Look), Flat + In the Round - YouTube
Waistcoat Crochet Hat Tutorial - Beginner Friendly - Melanie Ham