When you’re trying to define your personal style, sometimes it feels like all you know is what you DON’T like. Luckily, you don't have to. Instead, try this: define what your style is NOT and make a Not My Style list. When you’re trying to define your personal style, sometimes it feels like all you know is what you DON’T like. Luckily, you don't have to. Instead, try this: define what your style is NOT and make a Not My Style list.