Americantall.com is where I’ve been buying from recently. Do you have another option? ’ I’m 6’4" and 200 pounds. A typical large is too short. XL and XXL is wider and not longer. I need a place to order a Large X-Long.
Take a holiday in the Netherlands, visit any clothes shop, enjoy the length. Source: Am a 6’4 2xl Brit and shopping in Amsterdam is sartorial paradise.
In the UK, Jacamo are excellent.
Eddie Bauer and Carhartt are my go-tos. Both carry tons of tall sizes. Wrangler has some too and may be cheaper.
Gap has tall men’s pants and shirts. Pants 36" inseam and longer through the rise. They go up to 38" I think, maybe 40" but the longer rise really helps, they are not just long in the legs.