If you want to create a new skin and change the Player Model from Steve to Alex there is a skin bug. You can see it under the arms from Alex. There are green lines because the different sizes of the arms.
MCL-22483
Minecraft Player Model
Resolved
Duplicate
0
Thank you for your report!
We're tracking this issue in MCL-22236, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki