
1) Medieval armour
Found on
https://www.crosswordclues.com/clue/plackart

A Plackart (also spelt Placcard, Planckart or Placcate) is a piece of medieval and Renaissance era armour, initially covered the lower half of the front torso. It was a plate reinforcement that composed the bottom part of the front of a medieval breastplate. They were predominantly worn in the 15th century. Sometimes they were worn with a metal fi...
Found on
http://en.wikipedia.org/wiki/Plackart

Reinforcing breastplate worn over the breastplate often for the Tournament.
Found on
https://www.encyclo.co.uk/local/22686
No exact match found.