Spoiler: Apparently they thought everyone was going to be dressed in Ren Faire steampunk drag.
1900-1920s
Well, I guess not too far off the mark for the turn of the century. But these fashions look a bit like a community theater production of My Fair Lady.
1920s
The Roaring Twenties looks more like the "Roaring Bloomers."
1930s
Hmmmm...maybe they thought people in the '30s would be in to Little Bo Peep fashions?
From BuzzFeed