Americantall.com is where I've been buying from recently. Do you have another option?
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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.
Anytime you see shirts with a T on the end it means "Tall" and they are cut longer for people like you.
DXL has a great selection, but they tend to be very pricey and about 10-15% of their clothes fall apart after a few months. The other 85-90% are great. Clearance bin is where I tend to browse.
A large for me is basically a men’s crop top, and my shoulders are too wide, so I have to up-size to an XL. An XLT is almost always a perfect fit unless it shrinks in the wash.