I can see how that would work but I would feel bad punishing the other 4 kids who are excited to be out. Not to mention...that the ones who strip are the ones who usually would rather be inside.
The kids in my group who are "outdoor-lovers" tend to stay dressed and the ones who are my fair-weathered kids only like being out when it's +20C or better are the ones who tend to fuss about their boots, hats, mitts and want to act like they are in a nudist colony.