Vintage Vivienne Westwood Red Label Iridescent Taffeta Dress Women's 48 US 6/8

Vintage Vivienne Westwood Red Label Taffeta Dress Decorative button closure, A-line silhouette, long sleeves, Collared, Iridescent 100% Acetate; Dry Clean Gently used condition This is a vintage piece and likely runs small. I couldn't find a reliable size chart that coverts a size 48 to modern US sizing. I photographed it on the mannequin, which is a Small (around a 6) and the dress fit big. I think it's a 6 or 8. Please refer to the measurements below to ensure proper fit. Measurements (in inches): Armpit to Armpit: 17 Armpit to Armpit: 19 Across Waist: 14 Across Hips: 22 Shoulder to Hem: 44 Tags: Steampunk, Vintage, 80s, Vivienne Westwork, Formal