This one could use a little research. I don't have enough context to know whether this is really intended for medical use or is a costume pattern. The only other costume pattern I have from Standard Designer dates to about the same time but is in an entirely different number range.
Just a few years earlier during WWI, the Red Cross authorized patterns for surgical gowns, so the idea of home-sewn medical wear isn't entirely new.
This unprinted pattern and its envelope both show signs of wear.
