You're clenching too tight. Start out with a good fit from the prewash, after a few wash and dry cycles they will shrink into belly shirts.
Ultimate Comfort: Discover the Comfort Colors Sleeve 6014 - X Large Men's Clothing, T-Shirts & Tanks
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AM Fitted T Shirt 3 Pack for Men's Clothing - T-Shirts & Tanks
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Hanes Sleeve T Shirt Large White Men's Clothing T-Shirts & Tanks: Premium Comfort and Versatile Style
33 Review
Ashers Apparel Schrute Breakfast T Shirt Men's Clothing for T-Shirts & Tanks
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Men'S Regular Fit Short-Sleeve Dress Shirts By Allsense - Look Stylish And Professional!
41 Review
Men'S Long Sleeve Polo Shirt - Slim Fit, Stretchy, Breathable Collar
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Gildan Performance Men's π Clothing and Shirts with Moisture-Wicking Polyester
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π Nantersan Placket Raglan Tee - A Casual Must-Have
52 Review