In a fitting trends for uncertain times, menswear is going slightly gloomy for fall. Not to worry: the looks aren’t dismal or dreary, just charcoal trousers, maroon button-downs, dark overcoats, and lots of black-on-black looks. Look for Nom De Guerre button-downs and Robert Geller coats at Stel’s (334 Newbury Street, Boston, 617.262.3348). For a British-hipster take on the trend, shop for Opening Ceremony’s high-necked gray linen jacket ($504), or pick up a dark-gray canvas trench coat by End of an Era ($432), both at the Achilles Project (283 Summer Street, Boston, 617.695.2257).