The old saw about how vertical stripes is based on this idea.
The stripes encourage your eye to follow them up and down, which creates the impression of height while your eyes want to follow horizontal stripes to the side, creating width.
Instead, you want clothes that are relatively consistent in hue.
They don’t have to be perfectly monochrome – you don’t need to dress head to toe in black, for example – but keeping things within the same color-scheme helps the eye track over your body without stopping.
They’re the ones who stand out in people’s memories, who can command attention (and affection) with seeming ease.