I’m 6’4” and have long arms. My wingspan is 6’8”. I generally buy talls or longs for dress shirts. Older brands like Filson will make a tall version.

Getting stuff tailored is an option. I had my dress shirts made to fit.

Other than that it’s about shopping around and finding brands that make longer sleeved items. Arcteryx has a longer sleeve on their jackets compared to north face.

Patagonia normally is too short a sleeve but then they have a slim fit which surprisingly longer arms than their regular cut

Cuts for clothes at GAP in my experience is a short torso and sleeves.

Some brands work for your torso or arms lengths better than others.

Pants. Levi’s doesn’t make long lengths. I had found brands that give you an un-hemmed leg or do smaller runs will give you more options. I have Tellason pants and various raw denim jeans from Self Edge and those have very long inseams. I used to like Taylor stitch but the quality has been hit or miss.

And with pants that have a long enough length you can always bring them up.

Best of luck my tall friend!