I got one of these in black. I really like them. I'm normally a size ten, so I ordered the UK 12, and they fit just fine (just a lil tight around the waist but I like it that way). The black one seems a little looser in the waist than the blue, but not enough to really matter. I can easily take it in a little if I need to. As for length, they hit me about mid-calf.
Hemming will be easy, as there is no liner/slip, so I'll only need to hem one layer of fabric. The fabric feels pretty high quality and durable. It isn't see-through as it's a fairly thick fabric (but not too stiff), and it has quite a bit of stretch to it. The dresses look just like the pictures, although they may not flare out quite as much, but to me, they flare out plenty. I am not sure if I want a slip or will just wear it as is.