Vintage Lanvin full length dress

Perfect condition, very beautiful. Others have dated this dress as 1970s. Fabric care tag missing. Synthetic material. Hard to capture the color but it is black with a red/yellow/white motif. Comes with belt. Best fits a size M or US 8, I am a 4-6 and it is a bit too big. Make an offer! Measurements Shoulder to shoulder: 18 in Chest: 19 in Waist: 19.5 in Hips: 21 in Pit to pit: 17.5 Length: 52.5 in