Rob S
While mid Mo is not Fla re heat and humidity, it is a consideration, May-Sept here.
I think any Hanes/Fruit of the Loom/Big box brand Cotton/Poly blend shirt is going to be adequate for your stated use. I fully concur that a tank top/"wife beater is unsat day in day out as the lack of fabric makes for sweated out, stinkier pits v a full t-shirt. Oxy Clean is your friend when washing any poly underwear to knock out foul smells.
I tend to buy these things 6-8 at a time, wear them for a year max, knowing they are simply a consumable. The old ones get re purposed as rags, cleaning cloths, shoe shine stuff or are simply given away to Goodwill etc. They typically price out at 5ish per shirt max when purchased in a multi-pack. My t-shirt of choice has been the Costco/Kirkland brand of late but they do not sell a cotton/poly blend in store in my market.
https://www.hanes.com/cffwv3.html
https://www.hanes.com/hanes-ultimate...ck-uft2w4.html
YMMV