A wool jumper would be soft, warm and flexible.
A wood jumper would be hard and heavy.
A jumper made from glass could be dangerous. Glass is sharp when it shatters. The jumper would also be very hard and transparent!
A jumper made from metal would be nice and shiny but very heavy and cold to wear!
A jumper made from paper would be itchy and would get very wet and soggy in the rain!
A plastic jumper would be a bit too stiff and uncomfortable!