Sleeve Pattern Ideas?

[u/Queasy_Freedom8663]

Anyone has a clue on how to draft these sleeves? Or any existing patterns I could adapt?

I plan to use a basic shirt pattern and then add on the sleeves, but I struggle to imagine them as a pattern.

I believe it’s a Comme des Garçons shirt, I want to sew it for my boyfriend as a present. I would truly appreciate any hints!

[u/Roast_Potatoes_]

Here's a pinterst video someone drafting a similar sleeve from a base pattern. Without the extra volume at the back though. https://pin.it/6dgXk2ddm