It is the 'Afterglow' dress or nightie pattern by Make It Perfect. I wasn't totally convinced by Naomi's fabric choice (hmmm.... I think something red, just for a change, Mummy...), which is Paradise Garden by Amy Butler, but I do like it a lot now!
My Miss Muffet likes to be able to get clothes on by herself, and hates the feeling that she can't just whip something off at a moment's notice, if a wardrobe change is called for. So instead of the button and loop closure at the back, I opted for a tab with velcro closure, which she can reach back and rip open much more easily.
For some reason, I have been having visions of this very sweet, simple dress done in beautiful rich shantung silk, or duchesse satin, as a bridesmaid's dress.... what do you think?