wimple
is the word you are looking for (it's the white hat-like bit of a nun's costume)
(
prostheses,
Wed 3 Feb 2010, 11:11,
archived)
I thought that was a coif
Coif v Wimple
live on Sky Sports 2 Extra +1
(
Mighty Nibus who dares gins | @nibus,
Wed 3 Feb 2010, 11:12,
archived)