Interesting Hollywood Pattern 845 "Market Boy" Two-Piece Frock 1930's which research states at 1940's but the style, and pricing indicate 1930's and Ann Dvorak made movies in the 20's and 30's. So it's got to be 1930's. Got a number of Hollywood patterns so keep an eye out.
Have any of you visited the Commercial Pattern Archive? It's way pricey to "join" but if you are wanting to do lots of research it might be worth it - or even get a group together to join as one. Sneaky huh LOL. They indicate right now a free online access to non-registered users but after I did some research I couldn't get back in. If you want to try use "guest" as ID and "pattern" as password. Let me know if you get in!
Here's another link to check out some new stuff on the website about McCall's Sewing Patterns - and Vogue Sewing Patterns - even criticism is welcomed - grin.
Vintage Hollywood Patterns