Oh, I can't believe how long it took me to get these things finished! I'm afraid Marie Rose will have outgrown them, and then they'll only be useful to her as doll clothes.
The little sweater, or sacque, as it is called, is called the Peek-a-Boo Sacque. I found the pattern on Ravelry, which linked me to a website generously offering vintage baby garment knitting and crochet patterns. (Win!) Many of the patterns are available in matching sets of garments, but this one was a stand-alone.
I had to devise a coordinating pattern for the booties. I adapted and modified another vintage bootie pattern.
I'm mostly happy with the result. I'm working on a matching bonnet now, but dared not wait to get these out the door. Details on my Ravelry page.