Hi! Love the picture :-). I'd love to purchase the dress, but cannot decide on size. Would you say it runs small or large? I'm 5'6" 125 lbs and I'd like the dress to be on the bigger side to fall down the back like on the pictures. According to a chart I'm a size S, but I'm thinking about getting a size M. Sorry to bother, but I just wanted to ask about your opinion on the fit :-).