1) Camail 2) Hood 3) Medieval helmet 4) Ventail 1) Camail 2) Ventail 
An aventail or camail is a flexible curtain of mail attached to the skull of a helmet that extends to cover the throat, neck and shoulders. Part or all of the face, with spaces to allow vision, could also be covered. The earliest camails were riveted directly to the edge of the helmet, however, beginning in the 1320s in Western Europe a detachable...
movable front of a helmet
• (n.) The movable front to a helmet; the ventail.
Part of armour, a kind of mail curtain, fastened to the edges of the helmet with staples called vervelles. It covered the neck and the shoulders. Sometimes called as camail.
Av'en·tail noun [ Old French esventail . Confer Ventail .] The movable front to a helmet; the ventail. 
Also calleda mail tippet suspended from the lower edges of a 14th-century basinet as a protection for the neck, throat, and shoulders. · ventail.