NWT - United Colors of Benetton - Men's Black Classic Tee- Size M (EUSize)

I was on a solo trip in France last year I bought this for my teenage son at the Benetton store in Paris and it didn't fit him well - of course, I can't return it. I purchased it for 26 Euro - which is about $38 CAD. The hang tag is also bent a bit. Note that European Size Medium fits smaller than US medium. In my opinion, this shirt looks like a Men's small. (My son wears US M and it was too small for him) (Please see the French Benetton website for actual measurements and more details - link below.) https://fr.benetton.com/t-shirt-bleu-fonce-en-coton-bio-a-logo-vert-bleu-fonce-3I1XU1096_016.html