Part of your job as a parent is to teach your teen how to develop their own fashion sense. Now, they are going to learn a great deal of trend information from their misguided friends and you are going to see it reflected in their wardrobe. Some of it will make you shake your head, but if you want to stick with your teen through their lean fashion years, you need to know how to shop for them. That means learning their color combinations and fashion sense.
First rule is that most teens like to experiment with their color combinations. It’s like playing dress up for Halloween. It’s certainly something that they are going to get a kick out of doing. That means you are going to have to think off the beaten path and go with non-traditional matching colors. Unless your child is into black, go with neons and loud, expressive colors. You child will want to be who they are.
If you are looking for things that your child will be interested in, go for non-traditional patterns. While they say never to wear stripes that are in different directions (i.e vertical vs. horizontal) you can try something like that and you might find that the contrast is something that they will like. If they are a traditional fashion person then your job gets much easier.
Your teen is going to find that their color combination is something they have to craft over time and they will. You just have be there to guide them.