Todor Nikolov writes: If your mesh changes its size after parenting to a rig, then it most likely has a hidden parent. This often happens with Rigify rigs although the problem is not limited to Rigify. I show the solution to this problem in this quick 5-minute video.
from BlenderNation https://www.blendernation.com/2022/12/04/blender-rigging-unexpected-size-change-after-parenting/
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