I did wear a corset dressing in my 20's. It was part of my crossdressing paraphernalia. Buying it was quite an adventure, as it was pre internet days, and I had to go to a special store. I was 22 or 23 at the time, in better shape than today... I never wore it long time, so I didn't probably respect the steps a daily wear is requesting, as I wanted the lacing to be real effective immediately, so I was probably tightening it too much too. It did the trick, creating nice hourglass shape, giving the illusion of a tiny waist and by contrast rounder hips (well tinier from the starting point). But forget about comfort. Our Grand Ma used to complain sometimes their girdle were killing them in the 50's, and their girdles were far from being boned laced corset. I speak at least for first times. Maybe wearing one on regular basis is helping on that point. But you need to learn to move differently, if you don't want to be out of breath :-). It helps for posture then, as it reminds you to keep straight. And for your diet as you find eating large portions is no more an option :-) You may find on YouTube ladies wearing one on daily basis, giving great advices on how to start wearing one. Waist training is usually the key word... it tells a lot about the garment :-). My body used to revert to the usual shape after wearing it. I don't think wearing one on daily basis makes a difference on that point. I hope it answers your questions. Maybe ladies here have more experience than me about it and will tell you more.
Stephanie, X X