You will find that the 3XL offers enough length to tuck in.
IZOD Saltwater Graphic Tee Rapture Rose Size 3XL
A nice touch with the 3XL is the slightly longer hem for taller folks.
The Waterboy Bobby Boucher #9 Football Jersey Adam Sandler White Men’s 3XL
What I like is the unbranded look, which is so hard to find these days.
Tommy Bahama Relax Men’s 3XL Navy 100% Cotton S/S Crew Neck Pocket Tee
A nice touch is the solid colorway, letting the soft fabric take center stage.
adidas Amplifier Cotton Tee Short Sleeve Black EK0174 Men’s Size 3XL – NWT
I like how this adidas shirt keeps its shape wash after wash.