SER.O.YA Piper Sweater in Brown. - size XS (also in L, M, S, XL, XXS) SER.O.YA Piper Sweater in Brown. - size XS (also in L, M, S, XL, XXS) 62% viscose 22% polyester 8% linen 8% tencel. Hand wash. Mockneck styling. Lightweight sheer knit fabric. SERR-WK106. 3030-12. SER.O.YA is a New York-based contemporary brand with a purpose that transcends fashion. Through a collection of unconstrained, gender-optional designs, SER.O.YA aims to be a vessel for positivity: spreading good energy, encouraging connectivity, and catalyzing social movement. Each drop, SER.O.YA partners with a different organization, with a portion of the proceeds being donated to each charitable cause. We say do you, wear you.