Who What Wear has made a sweater vest that is a little bit preppy, a little bit rock ’n’ roll. The Knox is made to wear over white button-downs or alone with slouchy khakis and chunky loafers; with ripped jeans and high-top sneakers; with vegan-leather pants and oversize blazers. It has cable-knit detail and fits true to size. The. model in the 2 stock photos is 5'10" and wears size Small. Composition is 50% Nylon, 42% Acrylic, 8% Wool. In like New condition, worn one time.