Chanel Dress

Vintage Chanel dress 100% authentic Size 38 Flower broaches are both removable Has small faded stain on one of the straps

It’s supposed to be a smaller size but fits like a medium. I ordered it from a Vintage store on their website, but it arrived and was too big for me. It’s also a very old dress. Probably from the 80s

Seeking 350-400 dollar value please