5'6", 146 lbs, ordered a Medium. When I relieved this dress from its packaging, I was utterly delighted by how soft and luxurious it felt! I immediately tried it on, and it fit just as I wanted it to: snug but not too tight. In a word, cozy. Hubby says I look wonderful in it, and the blue color is vibrant and regal. Can't go wrong with this!See full review