The change skin page on the profile settings for Java Edition uses the Steve and Alex skins to display the two different player models available, but the Alex skin is not accurate to the one that's actually used. The sleeve layers are missing, and the jacket layer seems to be merged onto the body layer.
Last checked: August 17, 2023
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Just checked again, and Alex is still missing a few details from the outer layers (which the old skin didn't have).
However, now that the default skins have updated looks, the Steve model on the profile page is also different from the game version. I've created WEB-6396 to track that separately.
I can confirm this.