Could be. A volumetric doesn't make much sense, though it could be a quart of nails for the plate and less solid. Randall Storey's thesis gives us this regarding Edward III:
Konsatntin,Edward's blue-taffeta and white- silk jupon adorned with a pound of gold plate and dozens of silver buckles was typical for him. For the Dunstable tournament in 1342, he spent over £7 on a surcoat (tunica ad arma) embroidered with silver and gold figures. In an account from 1350-1352, we learn that a crest for Edward III's helm was made from red velvet and silk with a design of branches and wild men outlined in pearls; this crest sat upon a golden leopard itself wearing a crown of silver set with sapphires.
"Delicate iron" is my suspicion as well. Thin wire and small rings: almost certainly an indicator of mail.