Black Faux leather / pleather moto jacket size small

Bought off Amazon and only wore once. Perfect condition. There is a QR code inside the jacket and when you scan it, it takes you to a SHEIN website telling you it’s 100% polyester lol 🥴. There is no size in the jacket and Amazon isn’t telling what size I bought, I’m typically a small in everything and it fits me perfectly, but it might be a medium 🤷🏻‍♀️