I don't know what this hat name is,but this uniform motif is Japanese tour guide or Japanese bus Tour guide.That hat isn't small like this pcture.
Small hat wearing like this is Japanese girls facion style years ago.Motif are Fascinator or Cocktail Hat.
http://en.wikipedia.org/wiki/Fascinator

I know it's not the point of the picture, but what's the hat the girl's wearing? It (and herself) are cute.