They get your attention by looking a bit different, like wearing dramatic prints, a fairy costume, or an authentic vintage outfit. They are creative people who know who they are, and not afraid to show it.
Let's face it, everyone looking and dressing the same, it's boring (With the exception of uniforms, which are awesome and it's uniformity serves a purpose), and it's the people who are brave enough to step out of the box and take some chances, that will stand out.
Some people are too scared of drawing attention to themselves, don't know what to wear, who to be, and look to others. They choose one of the available trends acceptable to their community and just embrace being "blend".
The first step towards joining "the expressive", is asking yourself some basic questions, such as what colors you like, are you edgy or ladylike? Maybe deep down you always wanted to be a redhead? Finding something or someone that inspires you is a good way to start discovering yourself. Style has no size or a preference for appearance, anyone can be awesome. It's more a matter of combining your taste with what flatters your natural look, and creating your own personal twist on the style you feel drawn to.
If you want to express yourself, you need to think for yourself.
Showing your inside on the outside is an underestimated idea. It is how we signalize others about who we are, and a good way of figuring out who you have the most in common with (in terms of what your interested in). Plus, it's really fun to be creative! But, there is no harm in not wanting to be different (and there aren't 7 billion different style's out there. So, you know...) The point is to express yourself, and dare to be who you want to be. People should accept you the way you are, anyway. Keeping an open mind and respecting others is the only trend you should feel inclined to follow.
The rest of the time, create your own fashion and let your freak flag fly (or not). It's up to you.
The bottom image is from V magazine, and some of the other is from "Siralexanderthegreat" on instagram.)