It appears in myriad shades of gray and blue ... and is slowly supplanting the suit and tie as essential office wear. Typically, the vest is worn over a button-up shirt and paired with chinos ...

Jennifer stunned in a charcoal-grey pair of tailored suit trousers, styling the piece with a low-cut top, forest-green tailored blazer and a selection of dainty gold necklaces. It's a look that ...