I have a perfectly good pair of wonderful coveralls which I bought at Bowen's Farm Supply about ten years ago. I wore them once. Period! I thought that I'd wear them all the time (silly me!). So, you can buy them, basically new, for $75 (OBO).
Here's a link to them. Just in case the link no longer works, I'm including a stock photo from another brand, which is pretty darned close.
http://www.bernedirect.com/Deluxe-Insulated-Coverall.html
You may call me at 443-. Don't wait 'til it gets cold. Act now.