Open your VTuber model in your avatar editor or rigging software
Import or create the snuggie as a separate clothing asset
Match the snuggie’s scale to the model’s body proportions
Position the snuggie over the torso and arms
Parent or attach the snuggie to the model’s skeleton or relevant bones
Weight paint the snuggie to the body and arm bones
Adjust mesh clipping around shoulders, elbows, and hands
Add or refine blendshapes or deforms for arm movement
Test the snuggie in idle, pose, and animation states
Fix any stretching, gaps, or intersections
Save the updated model and export it in the required format
Load the model into your VTuber app and verify the snuggie works correctly