Soft uniform/polo shirts.

I know there are a bunch of us who are 6'5" and above. Has anyone found a good polo shirt that has an extra-long body? I haven't been able to find anyone who produces tall sizes, and my shirts keep coming untucked.
5.11 Performance Polos are fairly long. I have a few and I'm in that height range with a long torso. You can also order them in a tall length.

They have the typical things you would want (pen sleeves, mic loop)
I'm 6-4, the 5.11s Performance Polos are the best I've found so far. Still available in Tall length and that helps a ton. The standard length comes untucked for me after a few cycles of sitting and standing.