This is the pattern I used, dated 1974, bought from Mom's Patterns. I seem to have collected quite a few smock and tunic patterns although I don't like the modern versions and I'm not actually sure they suit my figure!
I used cotton fabric from a sewing co-op that I bought several years ago now, I remember that the fabric was called Nantucket, the buttons are from a local sewing shop.
I took five inches off the bottom of it as it was hitting me mid-thigh and making me look like a barrel, apparently I'm about a foot shorter than the drawing! I also moved the top button down a bit as I don't like stuff done up under my chin. I also left the huge pockets off which was lucky when I discovered how long it was on me as I would have had to unpick them and re-sew!
I'm happy with the way it came out and it was worth making it properly with the yoke facings etc as it looks quite professional! Whether or not it will get much wear I'm not so sure, it's one of those things you want to make but can't really see yourself wearing. Perhaps it will get an outing undone over a black tank top and jeans, we'll see!