The wonderunder that I used, to glue the two parts of my brim together. Got under my iron without me knowing it. And made a big white stain on the black woollen fabric ! Ofcourse I can't remove the stain.
The good news is that the answer is simple; a pleated, purple silk fabric over the underside of the brim. Just like I really wanted all along, for extra dramatic flair, but couldn't document for the Edwardian age.
After desperately searching the internet I found these pictures of Camille Clifford with the same type of hat.
The bad news is that I had to order new silk fabric. I think I am going to nickname this hat, the money pit!
Here more, not so period, but ever so lovely, inspiration for the hat.
Audrey Hepburn in My Fair Lady