Margaux demi flat in carmine suede, size 40 N

Brand new Margaux Demi flats in carmine suede, size 40 Narrow. Brand new, never worn. Comes with a box and bag for storage. I accidentally ordered a narrow, not realizing I needed a wider size. I'm a 9 and normally a 39.5 in Margaux but the 40 seems fine for me as a 9. Gorgeous red suede and super in style right now!