Give yourself the illusion of a few extra inches, simply by wearing the right things.
Dark colors not only give the impression of power and authority, they also make you look slimmer. When dark pants are paired with similarly dark shoes, it visually lengthens your legs. On the flip side, a contrasting belt would cut you in half, making you look shorter.
A close, cropped or slicked back hairstyle can have the same dwarfing effect as horizontal stripes. You don't have to spike your hair, but a style that's cropped tight on the sides and tall on top will instantly add some height.
A lean silhouette will look much longer than a loose one. A poorly fitted jacket will only make you look like a kid in a hand-me-down.
Look for plaid shirts with defined vertical stripes, herringbone jackets or pinstripe trousers—all of which provide your outline with some extra visual length.