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TREND-DRIVEN fashion rarely convinces anyone it’s practical, and mostly with good reason. Where does one wear a sheer dress? And how do you dry clean feathers? We must make an exception, however, for this season’s voluminous trench coats, which designers have supersized in terms of hem length (mid-calf or longer), volume (a la the famous Paul Poiret cocoon coat of the early 1900s) or sleeve length—or some combination of all three.

If you’ve ever broken into an unflattering sweat trying to wrestle a slim-shouldered trench…