It fastens at the top of the back with velcro:
And has a button on the outside to make it look like it fastens with a button. I'll need to tell the mummy to watch the child if she's one who chews things. My two never did chew things like buttons but I know some do so, mummy might have to cut the button off if that's the case.
I then made some cosy jammies.
Again, these are fastened at the back with velcro with buttons on the outside.
I must admit, I might make the dolly wear this top back to front because to me, buttons on the back of your jammies would be so uncomfortable to sleep in!
I have a piece of denim sitting on my sewing room table with the intentions of making a denim skirt for the dolly. I don't have a pattern for this so we'll have to wait and see how that one turns out!