Different manufacures use different cuts so whose ever fits best wins.
My daughter tried on dozens before she found a Bare that fit perfect, my new divebuddy tried on a few before finding a Tilios that fit right. I have 2 medium large Hendersons and a large Oceanic so even the sizing is different between manufactures.
Avoid surf shops, same manufactures but they seem to lack the arm, leg and wrist seals good dive suits have. That being said I did find my beanie in a surf shop, most dive shops want to sell you a hood. I use the beanie over a 2 mil hooded vest so I don’t feel like I am being strangled.