5 Black Knit Sweaters You’ll Want to Invest in Fall/Winter! 1. one Merino wool ribbed sweater From Arket (shown above), this one is very cozy and I like models that are ribbed and a bit tight. COS Cashmere, this shirt is what I live for now. A perfect basic shirt in the most comfortable material. 3. polo shirt Also cashmere from Arket. Good investment! Four. oversized sweater A stylish model from Stories. 5. Oversized Monki zip top (I wear it over). Stylish and comfortable.