This is a fabric formation modifier made with Blender 3.6 geometry nodes.

This uses a static mesh as an input, and distributes thread particles that dynamically scale in proximity to a chosen location. The shader is the same for both the thread object and shirt, but it can be separated.

To transfer the effect, select your custom object, then the modifier object. Press Ctrl+L and click ‘Copy Modifiers’ in the opened menu, which will copy the effect. The material can also be copied. The 'Fabric Transparency' shader node group controls the transparency, which should be copied to other mesh materials.

Please note this is a geometry nodes modifier, not an addon.

*This will only work in Blender 3.6 or higher*