You will find the crew neck is snug but not restrictive, ideal for all-day wear.
2 Pack Next Level #6200 Men’s Festival T-Shirt Color Sage Lightweight Breathable
You will find that a solid tee like this one simplifies your daily choices.
12 Pack BYC Men’s 100% Cotton White Undershirts Tank Top A Shirts MT01
A nice touch is the soft white color that doesn’t scream for attention but looks elegant.
Hanes® Premium® Men’s Cotton Modal Crew Undershirt 3pk “LUXURY SOFTNESS”
A nice feature is the lack of side seams, giving men a smoother fit.
Jockey Classic Crew Undershirts 3-Pack Black 2XL
What I like is the solid pattern, which keeps your look cohesive and tidy.