You will like how Rothco keeps the design minimal and functional.
Gildan (5-pack) Bulk Solid Heavy Cotton Short Sleeve Blank Tee T-Shirt S-XL
A crew neck design like this one works great for layering under jackets or hoodies.
Nike Men’s Sportswear Tee T-shirt Size Small AR5006-063 NWT
You will find that this Nike shirt doesn’t shrink in the dryer.
Animal Crossing Adult New T-Shirt – Outline Characters Under Symbols
A nice touch is that the small size has slightly shorter sleeves for a clean look.
Animal Crossing Adult New T-Shirt – Outline Characters Under Symbols
You will notice the small size keeps the sleeves from being too baggy.