In general, the 1910′s and 1930′s both have a very interesting feature in common: They’ve no idea who they really are.
With most decades there’s always experimentation and outliers, and sub trends, etc. But typically one singular style tends to rise to the top (think the New Look of the 1950′s). And yet the 10′s and 30′s both seem not to have a singular dominating image.
Sure, there’s that sort of general idea of what fashionable things should look like… But they’re almost suffering an identity crisis in the fact that there’s just too many opinions vying for attention- each of which is distinct enough from the others that it’s clearly recognizable, but following an underlying set of vague guidelines that tell you “hey, I’m from here on the timeline”.
I think it’s really interesting in particular, that you see these during the first major World War and the Great Depression respectively- but you don’t see the same thing with the post WW II era; by comparison, coming out of WW II, the fashion world knew exactly who it wanted to be.