Geoffrey MillerVerified account

3. Structure - the less structure there is in the jacket, the better it's worn as a separate. Light or no shoulder pads, unstructured or full-canvas chests, etc.pic.twitter.com/fEQBKaOxg9

You can also choose to have pick stitching done on the lapels, pockets, vents, sleeves, etc. Bigger stitches that are farther away from the edges (5mm vs 2mm) wins out herepic.twitter.com/pn5WgKUUHv

5. Contrast buttons - Buttons that stand out from the jacket, rather than blend in automatically make it look more casual and make it easier to wear on its own.pic.twitter.com/n0UTyUkE6s

6. Pattern - Be careful here, a lot of guys think pattern is the only thing that matters but if the jacket has a formal construction, smooth texture, and a lot of sheen, no amount of pattern is going to make it work. That said, pattern is busier to it helps with casual vibespic.twitter.com/ZnaaXCG3lb

7. Color - Same rule applies here as it does to pattern, the more unique the color of your jacket, the easier it is to wear as a sport coat. Just don't think it overrides everything else.pic.twitter.com/u7rOdE1ZRU

Here's an example of one that gets it wrong. Notice the massive, structured shoulders, lack of texture, matching button colors, etc.pic.twitter.com/SeBUDjcscC