Enza Costa Rib Tank Dress in Black. - size XS (also in S) Enza Costa Rib Tank Dress in Black. - size XS (also in S) 87% viscose 10% silk 3% lycra. Unlined. Rib knit fabric. ENZA-WD60. SRS1678. Designer of Enza Costa, Rogue, is a Canadian born based in Los Angeles. The line consists of comfortable yet luxurious fabrics like silk, cashmere, and supima and definitely brings to the collection a sort of understated sheer elegance. A staple must-have in any wardrobe, her tees are featured on celebs like Kristen Bell and Jennifer Lopez.