Only the inner part of a dual-layer skin will be visible if you use it while playing a Minecraft edition older than version 1.8. Starting with Minecraft version 1.8, skins can have a second layer on each body part. Why are there black lines on my skin's arms?.Why don't I see my skin in multiplayer?.Why does the website say that I have to pay to change my skin?.Upload a Player Skin for Minecraft: Java Edition.Learn about Standard and Slim Skin Models.How do I find my current version number?.So to change your skin, you must migrate your account to a Microsoft Account. Note: You can only change your skin if you have migrated your premium account.
For information on Minecraft, see the Minecraft Skins for Bedrock Version article for Bedrock skins. This article applies to Minecraft: Java Edition only.