tonlet
A long armoured skirt, designed for combat on foot.
historical
Accordingly, the Greenwich armoury hurriedly prepared a somewhat more conventional suit of foot combat armour made from existing pieces but incorporating newly made symmetrical pauldrons and a tonlet.
One of the plates which make up such a skirt.
historical
Soon after this the six or eight "tonlets" grow fewer, being continued on the lower edge by the so-called tuilles, small plates strapped to the tonlets and swinging with the movement of the legs.
Where it comes from
From Middle English tonlet, Old French tonnelet (French tonnelet (“high breeches; keg”)).
Adapted from the Wiktionary entry tonlet (CC BY-SA 4.0).