I can't find my old hat, although that's not surprising but I do remember how difficult it was to clean and starch.
I used to wash it the use spray starch to iron it to get the hat stiff. It took almost a whole tin of the spray starch and it still wouldn't stay stiff till the end of a shift.
In the end I cut a bit of cardboard and fixed insite the frill to keep my hat shape. Sister did not approve.
I wore an apron for the first year but then the uniforms were updated and we no longer had to wear them. This was in 1989.