Don't be deterred by dark colors. I think some older women tend to think black is slimming, hence they usually have too much of it in their closet. Look at the difference in laundry sorting colors between your parents, and maybe girls in your family. I know my sister and I have bright colors, red, yellows, pink, purples, lavenders, rose colors and then usually for the adults it's black, navys and whites. However just because you're young doesn't mean you can't have some black or dark colors. Really, don't save it all for the next funeral.
There's an old fashioned rule that says black and brown don't go together. I'm here to tell you that's not true. Your purse doesn't have to match your shoes either. I encourage you guys to have one smart, dark outfit, and it should be more than a black t-shirt and a pair of jeans. It could be a simple black dress that really fits, or pairing a dark colored blazer over a black t-shirt with jeans. Similar to what I did in this photo. If black seems harsh for you try navy, my new favorite neutral. If you're feeling really bold wear an oversized black shirt with black leggings, but make sure it's form fitting. Try pairing it with a bright bag or colorfol shoes and accessorizing it. You can also wear a black t-shirt and pep it up with colored jeans and sunglasses. Colors are cool, but black is sophisticated too.