For a 1940s dress that is both easily adaptable for the oncoming colder climes, as well as the warmer ones, at a purse-friendly price, look no further than this Floral Print Tea Dress from ASOS.
It seems the staple of the vintage wardrobe refuses to go away, even as the temptures drop. The frock in question is perfectly muted in tone for autumn winter, adopting navy and cerise in favour of the summer pastels. The elbow-length sleeves finish with a puff shoulder for a more authentic 40s look, and the v-neck, finishing with twist at the bust, makes it's flattering for vintage girls of all sizes.
At the paltry price of £40, you can't really go wrong. You can pick it up online.