Other things to do to look taller are to simply avoid taller people whilst standing on the same plane.
That reminds me of the story Ingrid Bergman once told on a TV chat show. The (very tall) Ms Bergman was doing a stage play with a leading man who was somewhat shorter than her. The director took great effort, not to have his two protagonists standing next to each other. When both were standing, they were at different ends of the stage; when they met centre-stage, one was always seated while the other one stood. Some years later, Bergman was in another play with Yul Brynner. The director offered a similar arrangement to spare Brynner the embarrassment of being seen as shorter than his leading lady. He rejected the idea and, turning to Bergman, said: "I'll show you up as that big horse that you are."