This is a pretty old vintage to antique male mannequin dress (shirt) form. Quite large and heavy,its not at all like the fiberglass ones you see today.I am not exactly positive of what all it is made of because it has a sealed bottom as you see in pic 3. It will hold a stand ,also in pic 3 that lining you see around the edges there is actually cork! It has a cotton fabric over it and that is stained on one side as I have shown in pic 4. I had thought about tea staining the whole thing but I sort of need to get rid of it right now for more room. The arm sockets I think are wood.It is quite large and heavy ,it measures appr 25" from top of neck to bottom,and is appr 18" across shoulders.
If you have any futher questions or I can be of help please feel free to convo me.