Finally a break in the weather, and our plucky heroine is at home all day, waiting for the UPS delivery of my Mom's sewing machine; she isn't really using it much, so is sending it to me... between house chores I managed to get outside to take pictures of my holey t-shirt:
After seeing Margy and her kappogi apron it was necessary for me to get in the wayback machine and travel back to November 1966, when Sunset Magazine published an article on "make your own Japanese apron". Our city library has open-stack archives going back many decades, and I was able to xerox the relevant information. The magazine article includes a pattern diagram for how to cut out a complete apron from two yards of 36" fabric (when I was young and learning to sew, most fabric was that width) as well as instructions on how to construct the apron.
Not quite the same exact styling as the pattern Margy used, as the sleeves are not elasticised, but according to the article, they made up a number of these aprons for their staff home economists to wear while working in the magazine test kitchen...
Maybe I need to make one of these to wear not just when cooking, but when working in the studio - wish I had some suitable vintage Marimekko fabric in my stash!