I love this apron, and it's so ingenious! I have thought of doing this but haven't ever done it yet (I think all the embroidered aprons are my favorites). It is a revamped napkin turned into an apron. I have a few old napkins, so this one's style is easy to copy. May not be the same dimensions, but that isn't so important to me on this one. However, I did take the exact measurements so if I want it the same, I can do that, too. The pocket is made from the removed corner piece, so it is made out of three pieces of material; two are from the napkin itself.
Not sure on the era on this one, but the pointed apron style was popular in the 1950's.