The “Vexillum” was a small flag-like object used as a military standard for each Legion in the Roman Army.
Each vexillum would normally carry the Legion’s number ( in Roman numerals) and the painted or embroidered symbol of that same Legion.
Unlike the normal Legionaries the Bearer would wear a chain-mail vest or even scale armour rather than the usual overlapping plate armour (the Lorica Segmentata). In addition, the “Vexillum Bearer” would wear an animal skin and head on top of his helmet and equipment.
Our K&C soldier wears a grey wolf skin pelt and head.