To sum it up, it's probably easier if you can find some third party mod which allows you to set custom skins for players (I'd imagine it somewhat similar to how can set custom, local names for people on certain chat platforms) if such a mod exists. You don’t have to go online or log out for these changes to go into affect. So, to change your skin in a replay, you'd have to go through the whole fetch-url-from-Mojang dance, then parse the replay and replace the old url+signature with the new one. Posted in 1.4.7 Mods, Minecraft Mods Comments Off on Change Your Skin and Capes in Game with the Closet Mod (1.4.7) The Closet Mod for Minecraft 1.4.7 lets you insantly change your skin and cape in game by using the closet. What happens when you change your skin is that Mojang simply assignes a new URL to the new skin and the old URL keeps pointing at the old skin, hence the player in the replay keeping their old skin.
The clients can then check if the skin URL is actually from Mojang using the signature (to prevent servers from faking it) and only then will the client go and fetch the skin from the given URL. It then sends those two things to all connected clients with the tab list packet.
The replay doesn't quite cache your skin, MC skins are a bit more complex: When you connect to a server, that server queries Mojang to check if your account is legit and also gets a URL to your skin with a digital signature for that information in return. While theoretically possible, this would be far from trivial to implement.
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