Well, Let's Make a Deal outfits are sillier, but, at least when I used to watch The Price is Right, which was admittedly many decades ago, audience members often wore loud colors and silly shirts and that sort of thing.

Looking at some more recent pictures, it looks like it's still pretty common for audience members to wear custom printed t-shirts with silly things on them. It doesn't seem as silly as it used to be, though.