What is actually a shacket?
Take a closer look to the name "shacket". "Sh" can defines as "shirt" and the pronunciation sounds like "jacket". WIth other words, shacket is a combo of a shirt and a jacket that comes in different thicknesses.
How to style a shacket
It's very simple. With a shacket you can combine it with anything. A shirt, a sweater, an overshirt and more. There are no rules to how to style a shacket, because it doesn't matter how it is styled, it will always look good no matter what.