Better skins customization

In Minecraft Bedrock there are skins that you can upload and skins that you can customize in parts (the face, the clothes, etc.) One thing that would be very good would be if you could upload skins and then add the things from the custom skins such as shoes, helmets or backpacks like that. many people who use the downloaded skins would add things to their skin for better customization (and people would buy more things in the marketplace)

It would also be great if this customization of bedrock skins were in java

sorry for my google translate english