You will find that a solid T-shirt like this one is a wardrobe workhorse.
SOLs Regent Fit T-Shirt Slim fit Plain Cotton Short Sleeve Crew Neck Tee XS-XXL
You will find that the black color works for both day and night.
ARCHAIC by AFFLICTION American Flag UPRISING NOW Short Sleeve Slim Fit T-shirt
This solid shirt is a no-fuss choice for busy mornings or lazy weekends.
Nike Dri-FIT All Day Cotton Stretch Tank 2-Pack S – Slim Fit Comfort -OPEN BOX
A nice touch is the solid colorway, which stays true wash after wash.
Jockey Men’s Slim Fit Cotton Stretch V-Neck Undershirt – 2 Pack
I really like how this black tee looks both casual and slightly dressy.