Vintage early 80s disco ruched waist dress

Vintage (early) 80s dress. Also gives me some disco vibes Size tags says 42 but please see measurements Size 8 mannequin Purple with a purple /black abstract chunky print( all the same color & print - photos appears almost ombre with more blue at the bottom my apologies) Rouched at the waist and shoulders Lined skirt Long sleeves Length of the dress is not quite maxi - hits above ankle Shoulder to shoulder: 16 1/2", armpit to armpit: 22', waist elastic in back: 14" - 17", length: 47"