Downton Abbey - A Milliner's Dream?

I'd love to know how the costume designer was able to track down

all the fabulous Edwardian hats worn by the characters in Downton Abbey.
Here's a collection of some of my fave pics...what about you?

(Pictured above: Jessica Brown Findlay, Elizabeth McGovern, Michelle Dockery)

We're halfway through the series now and I'm loving the scenes
with Maggie Smith and Penelope Wilton (and of course, their hats)!