You will find that an unbranded tee is surprisingly versatile for any occasion.
On Sale CSX Transportation Embroidered Pocket Tee [p22]
The crew neck here is a nice touch, giving the shirt a relaxed, everyday feel.
Retro The Hives band shirt Tour Unisex All Size Shirt 22D553
If you need a blank shirt for printing, Gildan is a brand worth sticking with.
Retro Metric Band Tour Unisex All Size Shirt 22D65
This Gildan brand shirt is a go-to for lazy weekends and casual outings.
Fear of God Essentials Tee ‘Stretch Limo’ XS Size Oversized T-Shirt SS22 NWT
A nice touch with this solid shirt is how it works for both casual and semi-formal outfits.