Size M which fits an 8-10 nice and oversized, and a more fitted 10-12. I bought this brand new from the Jacquemus store in Paris. I put some stain remover on a tiny spot… and THIS HAPPENED! I basically bleached a big patch. Absolutely heart broken!! This was about $560 new. Selling because I am no good at dealing with laundry issues like this. Maybe somebody else can buy it and dye it.. or tie dye it!? Or something!