POLO Ralph Lauren Mens Slim Fit Cotton Crew Tee Undershirt, Andover Heather/Cruise Navy, Bali Blue/White, Cruise Navy/White, X-Small US at Amazon Men's Clothing store
3-pack Regular Fit Polo Shirts - White/navy blue - Men | H&M US
Multipack Bundle 437MSR Sport Polo Bulk T-Shirt 3 Pack - Make Your Own Assorted Color Set, Small at Amazon Men's Clothing store