This round neck tee is a go-to because of its simple, flattering cut.
Zella Micromodal Crew Neck Undershirt T-shirt. Choose Size/Color
The crew neckline on this shirt is a nice touch for a clean, minimalist style.
Men 100% Linen T-shirt V Neck Summer Short Sleeves Retro Tops Casual Undershirt
A nice touch: the solid color makes it easy to layer under a hoodie or blazer.
3 6 Packs Mens 100% Cotton Tank Top White Wife Beater A-Shirt Undershirt Ribbed
You can grab this in S, M, L, XL, or 2XL depending on your fit preference.
NEW Soffe Military US Navy 100% Cotton T-Shirt Undershirt 3-Pack – Coyote Brown
What makes it a winner is the solid design, which is endlessly adaptable.