I believe he's wearing a European brand, but Filson makes excellent wool pants that are almost identical. The green color is kino.
The only piece of clothing/gear I've got that's Chinese is a wool M43 cap/alpine ski cap that's a similar shade of green (greenish-gray). The only non-Chinkshit ones I could find were Finnish surplus, and they didn't have the fold-down cheek flaps and were the wrong color. Nearly everything else I wear while /out/ is either mil-surp or modern made-in-USA that's a quality copy of vintage gear.
Be aware, everything made by Filson is expensive. Their wool pants are nearly $300. But damn are they comfy, durable, and functional. The only other wool pants I own are some US army surplus from the Korean War; they don't fit nearly as well, have only a couple of pockets and they're very small, and they aren't holding up as well as the Filson pants.