(My current shinguards from White Rose I got 'cos they were cheap? Maybe £20?)
I bought these greaves, they fit from ankle to over the kneecap, and looked like boiled leather. Black, with a coiled gold dragon on the knee.
Following previous injuries (non-larp), I generally wore a knee brace under these to protect my kneecap and act as extra padding.
One evening, a a local LARP system, I had a duel to fight as my combative character who wore these. In a hurry, I did not wear my knee brace. And in my duel (vs Drac, a very skilled fighter), he got a blow on my knee at just the right angle to cause the whole thing to turn, the impact also knocking the kneecap. At this point my kneecap, with a “squerck” sound, moved round to the side of my knee, and I feel over screaming.
I popped the kneecap back into place, and spent the rest of that evening at hospital, and the rest of the month on crutches.
I lost the duel, and there were extensive IC ramifications… but that is another story