I'm sort of concerned with the way you regard your school's "hierarchy of clothes." In this hierarchy, cheap clothes make a person unpopular and very expensive ones make them popular and "cool."
In my opinion, this attitude, and to believe in this kind of attitude - that expensive items make you cool and cheap ones are for trashy people - is a terrible way to go through life. I know it's just clothes for now, but as you get older, you'll see that there are a lot of rich people (though not all of them) who believe that simply by being rich and being able to afford expensive items, somehow this makes them better ("cooler"). That's totally untrue, and again, a terrible way to look at it. However cliche it sounds, what makes a person "cool" and "popular" is their personality and what is on the inside, not what is on the outside.
You're stuck in this mindset that you want/need to have the expensive clothes so that you can become more fashionable and then your social status at school will be higher. This mindset was created by those expensive brands solely so that they could sell their products. I'm not kidding - that's exactly what designer brands do. They set you up so that you're constantly striving to buy these expensive clothes so that you will become accepted by the group which will make you happy.
I promise you that true happiness doesn't revolve around being accepted by the group, whatever high school society says. Happiness comes from spending time with people you care about - friends, family, boyfriends. And those people? Couldn't care less about what brand you wear. (And if they do, they're not real friends). As an older person, my advice is to try to change your mindset and try to understand that what stores you shop at is not a mark of how fashionable you are or how cool/popular you are.
P.S.: you can totally be "fashionable" without dressing in a high priced brand. My challenge for you is to put together a fashionable outfit from the "low" brands in this heirarchy and see how many people compliment you on your outfit. When they ask where you got it, tell them you got it from the "higher" brands in this silly hierarchy. I bet they won't even know the difference (proving again how silly it is to believe that expensive items make you more fashionable/cooler/better).