$585 Isabel Marant Etoile Amandine Dress Size 8

$585 Isabel Marant Etoile Amandine Dress Size 8. Excellent condition. Worn twice. I’ve gained weight and it doesn’t fit. I think this dress looks better in person than on the model. The French size is 40 and the size chart says that translates to a size 8 US but please review measurements for fit. Color is navy even though it might look black in photos. Armpit to armpit is approximately 21”. The length from the area where there would be a seam at the top of the shoulder is approximately 36”. But, there is no seam so I had to guess where it would usually be so this is an approximate measurement. Has elastic at the waist. Made of 100% viscose.