You can see it in the arms and part of the legs

Mod List

TLauncher and others that allow you to play the game without buying it(and still having a skin) are not supported.

I'm not using TLauncher

You are using Offline Skins.

Some people I play with use cracked launchers, but they complain that their skins doesn't show, so I use OfflineSkins for them

so is OfflineSkins the culprit then?

It's possible that I've accidentally fixed it in the next release/current snapshot build(downloadable in the Actions tab here on Github). If not, I'll not look into fixing it, since it does violate Mojangs Terms of Service.

https://github.com/tr7zw/3d-Skin-Layers/actions/runs/2180295740 in the Artifacts file is a forge/fabric build for 1.18.x. Give it a try, maybe it works.

You don't need to risk ToS breakage, I just wanted to know why it happened. Don't worry too much about it, it's probably like a bad mod interaction caused by OfflineSkins.