A nice touch is the subtle white-on-white texture that adds visual interest.
New 3-6 Pack Men’s 100% Cotton Tagless V-Neck T-Shirt Undershirt Tee White S-XL
Medium is a staple size that most people can grab without second-guessing.
Tommy John 1003995N V-Neck 3 Pk Cool Cotton Stretch White Shirt (New in Box)
I have worn Tommy John shirts on long flights and they still look good.
Jockey Mens Tagless V-Neck Undershirts 4-Pack StayCool Technology White M
The solid design gives this shirt a modern edge without trying too hard.
New 3-6 Pack Mens 100% Cotton Tagless V-Neck T-Shirt Undershirt Tee White S-XL
This t-shirt works for all seasons because it doesn’t look worn out after frequent use.