This is Simplicity 9012. The pattern called for a lace overlay on the yoke, but my primary goal for a nightgown is comfort, so I left off the lace. The nightgown was very easy to make. I didn't time myself, but I easily got it done over the weekend, even though I spent most of the weekend catching up on work from the office. I'd guess it took 3 hours total, including hemming by hand. I made French seams, because it seems as though this would be more comfortable for sleepwear than serged seams.