If you want to hang woollens or clothes where the shoulders would stretch on a plastic hanger, a cheap effective way to 'pad' the hangers is to wind wide sticky parcel tape on the ends - over and over until you build up a thick padding. If you wind the tape on 'inside out' it will also stop clothes sliding off.

I purchased some velvet coated hangars from QVC - they are great, even little slinky tops stay put.