You will find that a solid T-shirt like this is a foundational wardrobe item.
Polo Ralph Lauren Blackwatch Plaid Soft Cotton Turtleneck 3XB Pony NEW $98.50
A nice touch is that the long sleeve cuffs are snug but not tight.
Under Armour ABC Camo T-Shirt 1357727-279 Men Regular Fit Graphic Tee
You will find the camouflage works well for both casual hikes and city wear.
Carhartt Force Shirt Mens Size 2XL Long Sleeve Black Zip Pocket Work Utility
A nice touch: the solid pattern eliminates the hassle of coordinating prints.
Adidas Essential Tee Mens 2XL Pulse Lime Green Trefoil Logo IL2520 NWT
This adidas t-shirt has a look that goes with anything.