I noticed that on QVC and QVC2, too, but it's just been recently I have been seeing it. Although, hosts and models claim they are wearing the same size, they said quite a few times when selling something how stretch help the pounds put on over the holidays.
I did see hosts, though, not all of them, who looked like they put on weight over the holidays, specifically, around the middle, and hips including the upper thighs. A few hosts, too.
Looked up types of TV cameras. The most sophisticated can make people look normal, thinner, or heavier by setting them.