Fashion is all-consuming. Once you're in, there's no getting out. Once you've experienced a season (or in my case, exactly 10) of fashion shows, even closely following them online rather than fully-emerged in person, you can't un-see the trends trickling down into mainstream fashion months later. You can't ignore your non-fashion friends' clashing of prints, proportions, or plain runway knock-offs; their synonymous use of "fashion" and "style" and "trend", their ignorance of couture, craft, and real clothes. Put simply, once you're in fashion, your mind will always be thinking in the fashion world, while your physical being will be living in a very un-fashion world. (Unless, of course, you're lucky enough, or put enough work in, to be working in the fashion world, living in the fashion world.) It simply isn't possible to dabble in fashion; you're either in it or you're not. It's not something you practice for an hour and put off to the side until next time, you can't study and pass a test for it.
Fashion is a way of living and a way of thinking. There's not a moment during my school day where some aspect of fashion isn't present somewhere in my mind, whether that be in observing/judging my classmates' style (or lack of it), doodling YSL's vintage, geometrical designs in the margins of my Geometry notebook, or thinking of yet another way to manipulate the dress code. For me, fashion is too central to be a hobby, but I'm also not infatuated with it enough to call it a passion. I decided, some time ago, that fashion is my distraction. But fashion doesn't act as a momentary distraction, it's a constant, nagging, Colin-McDowell-personified voice in the back of my head. Fashion attracts all types of people, with all different expectations of it. Because of fashion's rich and ever-growing history, one can never know everything about fashion (no, not even that seemingly all-knowing voice of Colin McDowell), but one can strive. You can never "master" fashion, like one theoretically can with sport or music, because fashion encompasses so much. The term "fashion" is simply too broad for one to become expert in all areas during a lifetime, though some have come close. Maybe it's fashion's fantastical nature that subliminally tricks people into thinking they can become masters, that there is a achievable end goal. Maybe it's fashion's open-endedness that keeps people intrigued. Or maybe we're just in it for the clothes. Whatever it may be, fashion is definitely not "hobby" material.
Lia and Odette Pavlova by Txema Yeste for Vogue Russia November 2015