I took a look through my pattern files and found Simplicity 1336 for a
25-inch doll, which should be pretty darn close. Also found a Retro
Butterick for the right style, though for 18-inch dolls; it might be
good for reference at least. That's B5865.
Good suggestions, Tiny. My sewing skills are... rusty. But I'll get
there. And I have enlarged patterns before - and drafted doll clothes
patterns using muslins. But it's been a while!
