Material of regional parts

The Shirt Ontology has the class Fabric (a material part) and the class Collar band (a regional part). But what if we want to refer to the fabric of the collar band?

There are also classes for material parts of a regional parts. One of these is Fabric of collar band.

This example shows the material parts of the Collar band:

Collar bandhas material part
Fabric of collar band, Interfacing of collar band, Button of collar band, Thread of collar band

In the FMA

The FMA has classes representing constitutional parts of regional parts. For example, these are the constitutional parts of Hand:

Handhas constitutional part
Skin of hand, Superficial fascia of hand, Musculature of hand, Neural network of hand, Vasculature of hand, Skeleton of hand