MILLY V Neck Mini Dress M (8) but fits like 4-6

Beautiful Milly V Neck dress in perfect condition. Slight stretch to the fabric, lined, lightweight but not see through. Runs SMALL. In my opinion this size 8 fits like a 4, maybe a 6 if you’re petite. Purchased from The Real Real but as it runs small it doesn’t fit me (I am a true size 8)