This add-on is from a model that I tried my best to port from Phoenix SC's "Thicc Minecraft Steve" for Minecraft Java Edition which he made during a livestream showing how he made it. Check out his video out to learn more about it.
Credit goes to him for the original model.
EDIT: the model is not intentional for it to look messed up on 1.13, the 1.13 update just messed up the model, so the 1.14 beta is recommended
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Changelog
EDIT: the model is not intentional for it to look messed up on 1.13, the 1.13 update just messed up the model, so the 1.14 beta is recommended
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