it is a cardigan
There are different kinds. Two examples of knitted headcovers are snoods and beanies.
The traditional samurai helmet is called a kabuto.
They call it a "helmet."
Attic helmet, Corinthian helmet, Beotian helmet, Chalcidian helmet, Illyrian helmet, Boar's tusk helmet.
They're not. Brioche knitting is a special knitting technique where the resulting fabric i about twice as thick as normal knitted fabric. Hats can be knitted using the brioche technique.
There is no typical name for it besides helmet, but it can also be called an equestrian helmet
knitted fibres are fibres that have been knitted... dah
it is called a "bridal"
colorfastness is property of color, not to change its tone and strength, when exposed to light (artificial or natural-sun) and/or washings, dyed on the knitted fabric.
a helmet is called 'un casque' (masc.) in French
Sarah knitted shirts for the soldiers.