Purchased an oilskin jacket similar to this one 27 years ago (the model details have changed, but the basic coat remains very similar). Worn it through 8 North Dakota winters before leaving for warmer climes. It continues to perform wonderfully; wore it this morning to hike with my border collie.
Two minor concerns to be aware of:
Oilskin finish, when refreshed, will stain other clothing if hung in an overstuffed closet. A couple weeks after applying the waterproofing, this issue subsides.
Not the absolute warmest coat for the badlands of the Dakotas in mid-winter. It's great in the range of 10 - 50 degrees. That is, it's perfect most of the days through late fall into early spring. Not the coat for minus 47 and 50mph wind out of Saskatchewan. I found myself wearing it far more than my warmest goose down parka, my go-to coat when the temperature dropped below 10 degrees.
A great, durable winter coat and spring jacket.