Love, love, love this dress! It's super flattering on (although tight, so wouldn't go down a size), and understated chic. Jeanne Damas is a personal style icon of mine, so it makes me feel more stylish just wearing her designs haha. The pattern is pretty spot on compared to the auth as is the dress design, although the sleeves aren't as puffy as they appear to be on the auth. The fabric feels like chiffon, but I'm not an expert so could possibly be a polyester blend. I'm definitely going to purchase others in different colours from this store.
Edit: there seems to be quite a bit of interest in this dress, so here are some fit pics.