tonlet

noun2

1. •
   (historical) A long armoured skirt, designed for combat on foot.

   • 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. — 2014
2. •
   (historical) One of the plates which make up such a skirt.

   • 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. — 1926