Wanting to borrow / hire male "kroje" traditional Czech costume for short film (12 May)

Hi!

I'm a filmmaker shooting a short comedy sketch on the 12th of May in North London and I'm looking for a traditional Czech male folk costume (I believe called a kroje) for a single day.
Can anyone suggest where I could hire or borrow a costume like this? Costume rental companies don't seem to stock them. Any suggestions gratefully appreciated!

Cheers

Lucas