LARP no, battle reconstruction yes. Blunted weapons, but otherwise? Everything’s real (and preferably matching the battle being reconstructed). Yes, even the weapons - the blunting’s the only difference between it and actual combat weapon used to maim and kill. Injuries and concussions happen often, but the reconstructors don’t care.
Does CDDA even have chainmail? I think it doesnt. And should be added, because you only need wire, pipe (or a bunch of metal rings), and bolt cutters to make one. Plus pre-made, super rare thingies like “maille t-shirt” (sic) - which you can’t make yourself because adding an unique jewelry-precision welding kit for a single item would be overkill.
LARPer would have fake broadsword, scabbard, and fancy clothes, without armor - because armor is tiresome to wear all the time so they sent it separately (and it got lost in Cataclysm).