Absolutely, a coat helps.

Yes, I always dress my Whippet for walks when it's cooler. They're so lean and lack insulation, so a coat makes them more comfortable. I found a nice fleece coat that fits snugly and keeps the chill out.

I do put a coat on my Whippet for walks in cold weather. They really feel the cold more than other breeds since they have very short hair.

Definitely use a coat for your Whippet in cooler weather. Mine used to shiver on our walks until I got a jacket for him. Whippets can be quite sensitive to temperature changes because of their low body fat. A soft, lightweight coat keeps him warm without restricting movement.