I wonder if the day is going to come when the girls hate me for dressing them alike whenever I can. In my defense, they seem to enjoy it now. My mother did the same and I think I was in the third grade before I refused to do it anymore.
That gives me two more years to enjoy stuff like this.
These are from an old McCalls pattern(not vintage, just a hand-me-down from about 10 years ago). They have a zipper up the back. I think any jumper pattern would work for this. Just add a second layer in the skirt for the apron and insert some ties into the bodice side seam. (I love jumper patterns because they make great sundresses for now and in the cool weather, just add a tee or turtleneck for a year round dress. These are going to be pressed into service for Thanksgiving.)
Just be sure the skirt is very full.
Because you have to be able to twirl.