You're better off going to a thrift store and browsing through their selection. Older wool coats are (on the whole) substantially better than anything being produced nowadays.

My general rule of thumb: US-made wool is pretty good. You'll be hard pressed finding anything better that one made in the UK.

New production wool (on the whole) is substantially lighter than wool from 50+ years ago. 32-36oz was standard then. Now, 24oz is considered "heavy" and most will be around 12-18oz. Most tend to be more open-weave and will let more wind through.