so other players can't see me using the deaths set for example (sword) so it looking like I'm hitting them with my fist? That would be cool...It's a result of relying on strength or dex from charms to wear your gear. What happens is the game sends information about your character to other people - your base stats, and all gear you are wearing - so that the other computers can see how to dress your character. If you require strength/dex from your charms, then that information isn't sent, which results in their computer thinking you can't wear those items - so it shows the other players that you AREN'T wearing them, when you can because of the charms.
If you want to see which items are "glitched" in this way, put on all of your gear, then take all stat-giving charms out of your inventory. Anything that is worn on your character that gets a red background as a result of this is "glitched", and can't be seen on other player's screens.