The Proper Fit Expand on this introduction about finding the proper fit. Your arms can be a different length, so both sleeves must be fitted. Lapels must lie flat. Coats are longer than in the past, but a good rule of thumb is the jacket should cover your rear end.
Jackets can either be non-vented, side vented, or center vented.
Side vents, long used in Europe, are gaining popularity, but the majority of our clothing will be non vented. We find it hangs better and is more flattering. With your arms at your sides, the back of your jacket should lie perfectly flat-there should be no wrinkles or waves in the back or collar. Your pants should hang freely, breaking just above the shoe. Shirt sizes change.