Some clothing designer just came out with the loose look. More like the lose look. You lose breath. No elastic waste bands at all. Layered elastic waste bands can severely restrict one's breathing.
Stretch jeans can be good.
The lack of heels then invites a stiffening of the knee and resultant restriction of pelvis and subsequent reduction of breath. What many people don't realize is that clothing that is too restrictive can cut off the ability to burn fat. What happens is that we wear clothes that don't stretch and allow us to breathe fully. Or we eat a big meal and wait too long to loosen our belts and this reduces our breathing capacity and restricts our ability, and interest, to burn calories with oxygen from the breath. And the food converts to fat.