Blue Life Dancing Days Swing Dress in Black. - size M (also in ) Blue Life Dancing Days Swing Dress in Black. - size M (also in ) 100% poly. Dry clean only. Unlined. Halter strap ties around neck. Neckline to hem measures approx 30 in length. BLUE-WD321. D118 2009. You may have heard about the trendy Planet Blue boutique in Malibu and Beverly Hills, but did you know about the store's own brand, Blue Life? Comfy hoodies and tees that aren't your basic old pieces, with details that will have you coming back for more.