Banana Republic Colour Block Dress sz 10 - fits more like 6

Banana Republic Colour Block Dress - fits better/closer to a sz 6, beautiful and trendy! Fabric does not have stretch to it. Features - black, blue and gray colour blocking - bold silver metal zippered closure - a-line skirt Size 10 but fits smaller, perhaps size 6. Gently used but in great condition. No holes, stains, pilling or fade. Waist 15 1/2” Armpit to armpit 18 1/2” Skirt length from waist 19 3/4” Measurements are approximate.