As you can see, they are QUITE large, but usable :) I wonder if the fact they didn't have disposable diapers in 1940 had something to do with it? And a size too big to start with... but I can make some adjustments and make a newspaper pattern to try a second one. And she will grow into these. Even though they are too big she said 'mine - with socks' and grabbed the front of them and hoisted them up - walking away to go play... I take that as a good sign!
They are officially 'sock pants' to Esme - she asked for them off for a 'butt change' a few minutes ago and said 'sock pants off - no sock pants - need butt change.' ha!
A modern example for this pattern is Simplicity 5874, and it comes in multiple sizes. I might need to remember that later.