Vintage 70s angel sleeve maxi dress

Gorgeous floral print on black ground. Peach yoke, waist ties, & the sleeves are fully lined in the peach fabric. Pulls on overhead & made for slight build as shoulders are 15” across. I am pretty sure it’s acetate, but could be poly. Fabric has slink, but is substantial. Bust to 35,” high waist to 27,” sweep at hips is 42,” sleeve length is 19.5,” sweep of sleeve is 48,” length of dress is 56.”