I ordered a M in this dress and it’s perfect. I am 5’10, 148lbs. The dress is very flattering and has a type of lining in it so it is not see through. It is also very warm so if you live in the south, you may not be able to wear this in WARM Fall weather. A chill in the air is definitely needed in order to wear this one, but it is so beautiful and the colors are perfect for Fall. The dress snatches you in all the right places so if you are a shape wear girl like me, you can skip the shape wear with this one. This dress is truly perfect and give you an hour glass shape. Love it 😍