"Ethnic" elements in fashion in the 1930s and 1940s

We have probably all heard/read that the interest in fashion inspired by Latin America in the US was caused/influenced by the fact that the war in Europe made travelling there difficult and so South America became the "in" thing for wealthy americans and that this was further enhanced by the fact that movies meant to have an exotic location then were made in, or were about, South America instead of Europe for the same reason (I watched "Down the Argetine way" with Betty Grable the other day). But do any of you ladies (and gents) have any references to articles and books which discuss this? Or at least close?
I have an idea about a small-ish research project that I want to make, but I need to base it in previous research of course.

Anything?