I have worn the coveralls in colder weather. As a construction electrician, working outside for 15+ years, I got to the point where I didn't care about the weather. Not that I like being cold, I just wanted to go flying pretty  bad. Something as simple as putting rubber bands or velcro around your pants at the ankles can make a big difference too. I have also used a product for the  bikes made by Widder, who is now defunct but still available with variable heat that works great and really extends your season.

Steve.

Velcro is good for many things. I keep several Velcro straps on my plane, usually wrapped around a tube. I use them for tying up loose steering lines and strapping down my risers to keep them from moving during trailering (open trailer) plus close off my pant legs when flying. You can get Velcro straps long enough at many places like Wal-Mart, Home Depot, etc. I get them with hooks on one side and pile on the other.

Besides, if you have a front brake, they make a great parking brake!

In the summer mornings its a light windbreaker, shorts and waterproof low cut shoes. In the summer evenings its t-shirt and shorts. In the winter its a insulated jacket, jeans and high top waterproof shoes. Below 30 degrees its a loose pair of sweat pants under oversized jeans and a insulated jacket under an oversized wind breaker. The sweat pants take care of any wind blowing up the leg area and the windbreaker takes care of any dampness. I can always unzip if too warm.
Its the layering of clothes and waterproof shoes I believe is the trick to comfort.

Herman