EXCLUSIVE AT NET-A-PORTER.COM. When it comes to Sies Marjan's designs, we always expect there to be a strong focus on color and texture and this 'Fern Pickup' sweater doesn't disappoint. Knitted from cotton, it has a spliced hem that's gathered at the front to create a tucked-in effect when worn with jeans or pants. Take cues from model Martha Hunt who wore the pink version in New York recently with a tonal skirt and boots.