If you need a blank shirt for printing, Gildan is a brand worth sticking with.
Gildan Mens Short Sleeves Heavy Weight Cotton 6 oz S-5XL T-Shirt M-G200
This tee is designed for men, with a straight hem that pairs well with jeans.
3 PACK Men’s Pro5 Short Sleeve Plain T-Shirt Super Heavy Weight – S_3XLT
You will find that this solid tee holds its color well over time.
3 Pack Of Hanes 5180 Unisex Plain Blank Casual Beefy-T Shirt Stylish T-Shirt
A nice touch is how Hanes keeps the seams flat to prevent any chafing issues.
Men’s Tall T-shirts Short Sleeve Plain Blank Cotton Heavy Weight Big Size Crew
With a solid pattern, you get a shirt that works for any occasion.