The news broadcast neglected to address how breathability would be affected. The material needs to be airtight enough to hold the argon in. This would preclude passing of significantly larger water molecules (clumped/associated together by hydrogen bonding) in the vapor phase.
Thus, in active sports, such as skiing, things could get hot and steamy under the collar very quickly. And when it comes to winter outdoor activities, staying dry is more important than staying warm.
Guess the guy should have taken college chemistry after all...