Purple Sateen Mini Dress Size 2

Adorable purple iridescent sateen-like mini dress. Vintage from the 90’s. In excellent condition. Worn once. No manufacturer’s label. Size says 8, but fits more like an XS/2. Measures approximately 14 inches across chest and 26-1/4 inches long, not including spaghetti straps, and seat 18 inches. Please compare with something that you already own that fits you. There is no give in fabric.