We have gotten into a groove of wearing small clothes to portray a vision of a smaller, leaner body. For some people this works, but for most of us we just look like we are stuffed into a "too small" suit.
This gentleman creates the illusion of a slim waist by wearing a coat with a slightly extended shoulder. The back belt helps to heighten this illusion.
I have to add that this gentleman was very proud of being 52 years old and in great shape due to boxing. If you still have it at that age then flaunt it!