(Taylor's Version)

The Princess and the Frog has probably the most explicit and clear settings of any Disney animation (beside Pocahontas of course) - 1920s New Orleans. So no ambiguity there. I do like Tiana's blue dress much more, but the green is one that's in all the Disney Princess merch and it is nice to have some variety among the colour of the dresses in the full set, so I went with it. It really has nothing to do with 1920s fashion, but 1920s robe de style is close enough to the silhouette. Robe de style was a dress with full skirt combined with the fashionable low waist silhouette. It especially references Rococo fashion and often was especially full at the sides, sometimes including something like panniers for structure. Layered styles for robe de style were fashionable too, which fits surprisingly well with the leaf look.

Here's some references I used.

Hair relaxers were invented by a Black man, Garrett Augustus Morgan, in 1909, and were very popular among all Black people in 1920s. Black women relaxed their hair to achieve the fashionable wavy bob cuts.

Circlets, diadems and "crowns" were very fashionable, but they were worn very low, very close to the head, often covering the forehead and even brow.