Required Resource Pack
A new resource pack has been made mandatory for the server (it will auto-download on connect) that will render all player armor invisible when worn.
The intent here is to allow players to make use of the /skin command and select whatever interesting skins they want, without them being uglied by the armor you wear.
Please note that this also means that armor placed on item stands will be invisible. This is an unintended side effect but not something we plan to change for the moment.
Here is the info on the resource pack, should you have questions
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https://modrinth.com/resourcepack/invisible-armor-model