My version isn't completely faithful to the original - mostly because it's very hard to make out the details on screen, and also because the size of the available sample makes it impossible to recreate the full repeat. So I've reinterpreted it slightly (my apples have slim leaves instead of the feathery leaves the original fabric seems to have, as seen in the close-up below), but it's largely accurate - perfect for anyone else who's planning to run up their own version of Betty's outfit.
A glimpse of the matching clutch bag:
And a close-up so you can have a better look at the outfit:
This new print will be available through spoonflower.com as soon as I've verified the printed swatch. I'll try to make the colours as accurate as I can to the original too (Spoonflower are currently updating their printing process and I've got to send off for a new colour chart so I can get the print colours right).