NWT Madewell Fair Isle Frankfort Cardigan Sweater Look no further for your new favorite cozy sweater. Knit from a toasty wool-blend yarn, this vintage-inspired fair isle cardigan has a button front and swingy, boxy fit that'll never go out of style. Boxy fit. Body length from high point of shoulder: 25 1/2" (based on size 2X). Wool/nylon. Do Well: this style uses RWS-certified wool from farms that take a progressive approach to managing their land and caring for their sheep.