
Definitely a size smaller (I have) fits my husband in large shirts (usually Gildan) and I bought him medium and they fit almost perfectly. maybe even a bit big.

Men's XXL Super T Mockneck π from Lands End - Clothing, T-Shirts & Tanks
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Carhartt Workwear XXXXX-Large Men's T-Shirt β Original Clothing for T-Shirts & Tanks
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Hanes Sleeve T Shirt Large White Men's Clothing T-Shirts & Tanks: Premium Comfort and Versatile Style
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Next Level Premium Fitted N6210: High-Quality Men's Clothing & Essential T-Shirts + Tanks Collection
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Gildan Performance Men's π Clothing and Shirts with Moisture-Wicking Polyester
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Men'S Regular Fit Short-Sleeve Dress Shirts By Allsense - Look Stylish And Professional!
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Van Heusen Traveler Stretch Men's Shirt
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Calvin Klein π Herringbone Sleeve Men's Dress Clothing
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