I would think a generic narrow shoulder like this would do...
https://onesixthkit.com/index.php?route=product/product&product_id=9&search=body
I used that for my Jake Lockley...
I've bought 1/6 parts and figures from AliExpress. The only issue is sometimes they get canceled due to not being in stock - when they come - they are perfectly fine. I've never gotten a knock-off, unless I specifically ordered one (Crazy Toys for example).
I'm figuring it will be good regardless - I ordered two to have the body to display both sculpts, but am also planning on using the extra head for a Poe!
Was glad to get one in the last batch. For those looking for those 9 cloth boots - there are a couple of listings on e-bay for
Soldier Story SS089 1/6 Scale US 82 Airborne Gungle Boots Model for 12" Figure
They look like a good choice!