I think they'd fit fine, though you'll want to pick a larger size. Some fit over MTB shoes, so they ought to fit over your casual shoes. Look for ones that are rubbery on the bottom for wear issues, and so they won't be as slippery. I like the PI Am/Fib ones, because they're fuzzy on the inside, water repellent, and also block wind on the toes. Even when it's near freezing, I only need these toe covers and one pair of socks and not the full booties. By the time my feet go numb, the rest of me has gotten sweaty enough to go numb too, and so then it's time to stop anyway.