Example using Blender

Open Blender

Import the previously downloaded default avatar template.

Check that it has been imported correctly.

Create the desired garment using the avatar as a mannequin.

Once the dress has been created, proceed to apply weight painting based on the model's bones.

Once the head skinning is done check that the selected objects within the model's armour are hidden.

Proceed with the export in GLB format.

Check that the following settings are selected.

Your dress has been perfectly exported and is ready to OVER.