Not everyone can feel professional in pyjamas. In fact, much research has shown the benefits of dressing up for the part, even if nobody sees you. — Westend61/dpa It makes more sense than ever to dress casually to work. After all, most of us are no longer schlepping into the office every day and not being seen by colleagues while we work at home. For video conferences you can quickly throw on a decent top without having to change out of your comfy tracksuit bottoms. But how does this kind of behaviour influence the way we think of ourselves and our productivity? Do we really work better in a business shirt or blazer?