With the mercury starting to dip, a new cold-weather topper could be in order. But given the current climate—and here we're not talking about the weather—any purchase has to tick all the boxes. A sleek puffer jacket is flattering (strategic darting tames the "marshmallow" effect), on-trend (see the peplum waist), and versatile enough to take you from city streets to mountain lodge. In other words: Here's one investment with a positive return.