"I ordered this in the navy initially but liked it so much I ordered the silver too. Unlike so many of Free Peoples items, the fabric is actually thicker than you would expect. So, you can definitely wear this as a dress as well as a slip. The photos make it appear thin and "unforgiving" but that is not the case.
The colors look as the photo shows.
I ordered a medium. It fits great. Well, I would have liked to try a small but when I ordered, they didn't have them. The only reason I would have liked to try a small is the top is a bit loose but it doesn't look "wrong". I liked the medium because it looks a bit more blousy than the picture you see on the model. I think that lends itself to being worn as a dress. If I were only planning on wearing it as a slip, I might try a small but I think I'll be using it as both a dress and slip. So I'm happy with the size.
The length on me comes mid-knee or slightly higher.
Here are my stats so you can have an idea of your sizing.
I am 5'2" and 115. I consider my shape as being slightly curvy. I have a long waist. I'm a 34C. I wear size 28 in most jeans.
I would say this runs true to size. I would typically order smalls or mediums in Free People. I believe both would fit."