Backstage The Riviera Pant in Black. - size S (also in ) Backstage The Riviera Pant in Black. - size S (also in ) 100% viscose. Hand wash cold. Hidden back zipper closure. 36 at the knee breaks to 39 at the leg opening. BACK-WP16. 74 245 92. Backstage is an Australian made clothing label that has street style, a bit of glam and a lot of rock. Backstage is influenced by music & the arts. Sequined, striped, or draped, Backstage is a line designed for girls with a rock and roll attitude.