I wasn't intending to make her nightgown but now I have the perfect pattern I think I may have to start this costume. I'm currently trying to find a new wig as my old one is pretty tatty now. I'm not entirely sure what fabric to make this out of at the moment but I know I won't be using anything too shiny, and cotton will be too stiff. It needs to look soft and warm.
If you're interested in the pattern it is Simplicity 2163 and its by Arkivestry. Simplicity is currently having a half price sale so now is a good time to pick up some new patterns. I believe the sale ends in mid-September so better hurry!