I'm a big fan of the Buck Naked underwear.
Their t-shirts over there are superior too... I am a big, big dude. Wide. Back in the day, double XLT and if I hulked out in one, I could tear the back right out of a brand new one. Your average t-shirt would last me about 3 months. I wreck em. Really I need tripleXLT
Duluth's t-shits are long by nature. You don't have to worry of a 'T' marking. They are made for Tall. Long in the tail already.
And they are thick... High-grade thick material.... And they have a gusset on the back of the neck that helps soak up sweat, but is there to reinforce the top of the back. I still tear em out in the back. The stitches of that gusset is where they finally go... But I do mean finally. Those shirts are faded all the way out, over years before they're done.
If you work for a living, you need Duluth to make your t's