French to English Art/Literary History Helmets

Taken from a document discussing reproductions of Napoleonic cavalry helmets.

Chenilles et plumets réalisés avec différents matériaux
qui reproduisent de façon fidèle leur aspect d’origine.

There is a diagram of the helmet, with "chenille" labelled as the ridge of feathers or hair that stretched from the back to the front of the helmet through the middle. The "plumet" is a group of feathers that stick straight up to the side of this (and are not in a line).

Looking online, this central ridge seems to be referred to as the "plume" but I'm assuming this is the translation for "plumet", so there must be something more specific. Any ideas on "chenille" - or if it is "plume" what "plumet" would be?

Many thanks in advance