10 Years of LISA YANG. In celebration of the 10 year anniversary, the Signature Heidi sweater is reimagined in a limited, special edition with a hand-embroidered small heart on the cuff. Knitted in our mid-weight 7 gauge cashmere, the Heidi sweater is detailed by a ribbed, standing high-neck, dropped shoulders and a relaxed silhouette with a split high-low hem.