Seems like they often wisk them off to the Islands while they are at a cocktail party or promo event. That's why the girls often are in dresses and guys in suits.
But you are correct. Every outfit that I wore once I was chosen to be on the show and under their control would be something with various layers and good underpinnings (love that old word
), and would have a belt (for when I lost weight) and sensible shoes.