What I like is the solid pattern, which keeps your look cohesive and tidy.
Hoodie Orange High Visibility Shirt / Air Cooling Flow w/ UV Protection
A nice touch is the stripe aligning perfectly at the shoulder seams.
Wake Up and Workout Motivational Quote T-Shirt Gym Exercise Unisex Graphic Tee
An unbranded shirt like this one is perfect when you want to keep it low-key.
Straight Outta Port Charles T-Shirt General Fun GH Hospital Alliances Dr. Steve
A nice touch is the unbranded tag, making it comfortable to wear all day long.
Gildan Purple Ultra Cotton G200 T-Shirt G2000 Sizes S ~ 5XL s / s G3 morado
The round neckline is neither too tight nor too loose—just right.