I'm a UK12/14 and I got this is a 14. I easily could have gotten the 12, the material is very soft and stretchy. However, the size 14 isn't too big either, the sizing is pretty forgiving. I love that you can wear it with the peep hole in the front or the back depending on how much skin you want to show.
Fits wonderfully and comfortable! So happy with this dress!
Soft fabric, flattering cut. Another excellent N.E. item