Try this shirt thumbhole design from Threads Digital Ambassador Becky Fulgoni. It is sturdier than in-seam versions and better placed to accommodate each thumb.
Sew Sturdier, Better-Placed Thumbholes Into Sleeves - Threads
How to Sew Up Holes: Easy Fixes and Repairs
how to sew HANDCRAFTED HISTORY
Thumbhole Cuffs – The Hack We All Need – Sofilantjes Patterns
Better Than Bought - Thumb Hole Hack
Best Patterns of 2017 1/25/18 - PatternReview.com Blog
Step-by-step guide to help you sew zips & sleeves, My Thrifty Life by Cassie Fairy
How to Sew Up Holes: Easy Fixes and Repairs
Gift for Occupational Therapist, Custom OT Design, Pullover Sweatshirt or Full Zip Jacket With Pockets, Ot, OTR, Otrl, Aota, Cota - Sweden
how to sew HANDCRAFTED HISTORY
How to sew a button onto a jacket with a liner - Quora
How to Sew Thumbhole Cuffs - Melly Sews
how to sew HANDCRAFTED HISTORY
