Hanes Men's 5180 Beefy-T T-Shirt

Walmart - Crown Craze

Excellent color match (vibrant, deep purple), Crew neck style, Short sleeve t-shirt, Basic t-shirt form factor (Hanes Beefy-T is a common, generic style), High priority retailer (Walmart)

Gildan Men's Ultra Cotton T-Shirt

Michaels Stores

Vibrant purple color matches closely, Crew neck style matches, Short sleeve length matches, Standard fit appears consistent

Florida Women's Heavy Weight Crew Neck Short Sleeve T-Shirt

YazbekUSA

Excellent color match (vibrant, deep purple), Crew neck style, Short sleeve t-shirt, Women's fit is plausible for the person in the video, Basic t-shirt form factor