If you are broke and don’t have enough money to buy designer clothes. You have to accept what you have got. Even if you may have the latest trends of fashion clothing you still have your right to be trendy!
Try to check what you have got. Pull out your entire closet and spread everything out. Organize and group your things by color, and set them back in your drawers. After that, try on everything!! Put your hair up in a ponytail and get to work, trying on every piece of clothing you own. Take your favorite item and place them in a special drawer. And every day, keep a journal of what you wore, and ideas for new outfits. Maybe your second-day-back-to-school outfit could work for the one of those last few days of school. Add a couple things to it, and you have an already made superstar dress ready to go. And besides, who would remember that from way-back-when.
Do not wear the same outfits twice, and go as long as you without wearing the same shirt over. You can try going into your sister’s closet or even your mom’s closet, and take out something cute. You can wear it once and never wear it again, and make people wonder where do you get those new and old things, because they never seen them.
To avoid wearing the same dress again try looking through Teen Vogue or something high fashion like, and choosing an outfit you really like, then seeing what you have that looks like that. Look at a color wheel. This will help you see what colors are good contrasting colors or colors that compliment each other.

Changing the outfits and matching it up can be useful. It is all up to you how can you make it more creative and trendy. Just express yourself and be happy on what you are doing.
Source: How to Make High Fashion Outfits