You'll want to access the player itself, and find its name. Then after that, you'll need to set the .CanLoadCharacterAppearance to false, as it's set to true as default. ".CanLoadCharacterAppearance" is a boolean that determines whether or not your character's appearance loads when the game finishes loading. This code helps to override your character's appearance, in a normal script:
1 | game.Players.PlayerAdded:connect( function (player) |
2 | local appearanceOverride = game.Players:FindFirstChild(player.Name) |
3 | appearanceOverride.CanLoadCharacterAppearance = false |