I made a new three of a kind doll dress for fall/Hallowe'en. It's made from a modern fabric with a vintage print so it will work well for the 1930's all the way to the 1950's.
The dress is loose enough it will fit the older Pleasant Company style dolls.
It's available in my Etsy shop here. https://www.etsy.com/listing/476814757/three-of-a-kind-halloween-fall-orange
I'm in no way affiliated with American Girl or any doll company. These are dresses that will fit these sized dolls.