An unbranded T-shirt like this one is perfect for minimalist wardrobes.
Easy care Proud Millwright Cotton Crew neck T-Shirt Made in USA S-5XL
This is an unbranded shirt, so you can layer it without any bulk.
Black Wolf Graphic NatureT Shirt Sz Lg Mens Easy Care 100% Cotton Short Sleeve
You will find that the short sleeve cut works well for both men and women.
Vintage 1997 Birmingham Automobile Dealers Racing Easy Care Tshirt – 2XL
The crew neck here is a nice touch, with a reinforced band that lasts long.
Easy-care Cnc Operator T-Shirt Made in USA S to 5XL
This tee is unbranded, so you get that clean, minimalist look without any logos.