Persi Tank - ChocolateElka Collective Persi Tank in Chocolate is comfortable, easy wear wardrobe essentials are the crux of our everyday outfitting. The Persi Tank is made out of Elka signature cotton fabric for a lightweight and luxuriously soft feel. Cut to a fitted silhouette with a scoop neckline, think shoulder straps, and a fine rib texture throughout, the Persi Tank can be worn with casual cargo pants and denim for warm weather outings or layered under shirts and