Seasalt knit vest size Uk 12 US 8 Never worn

Ordered this from the Uk and got the size wrong. I’m a size small and I’d call this a medium. Color is best represented in pictures from website. https://www.seasaltcornwall.com/east-view-merino-knit-vest As they say…”The simplest pieces of clothing can often tie whole outfits together. With a neat shape and ribbed edges, the East View Vest is made from soft, lightweight merino-rich yarn, and will layer over everything for an instant update.” Main Garment:80% Lambswool (RWS) 20% Recycled Nylon Semi fitted Crew neck 7 gauge knit Hand Wash In Cold water