A nice touch is the subtle stitching along the collared neckline.
Printed Machinist Set Up Operator T-Shirt Made in the USA Size S to 5XL
This is an unbranded shirt, so you can wear it without any labels showing.
Set Medic Clapboard Premium T-Shirt Made in the USA Size S to 5XL
This T-shirt is unbranded, so you can wear it without any flashy logos.
4-baby Blue AAA Alstyle Mens Plain Short Sleeve T-Shirt Casual T Shirt 1301
With a crew neck, you get a straightforward look that works for daily wear.
3-Large Green AAA Alstyle Mens Plain Short Sleeve T-Shirt Casual T Shirt 1301
This shirt has a standard crew neck that never goes out of style, honestly.