Vintage 1970s Biba Kaftan Sweater Dress Red Orange Purple Stripe 36 Medium

A pristine burgundy kaftan sweater dress from iconic fashion brand Biba, circa 1970s. There's no materials label but it feels like an acrylic blend knit -- soft and close-knit. Crew neck. Four button bodice. Side slits. Could be worn on its own or over pants. Marked "36" but based on measurements I'm calling this a Medium: 20" armpit to armpit laid flat, 19" at approximate waistline, 42" top of collar to bottom hem. In Excellent condition with no rips, tears, repairs, or stains. Little to no signs of wear.