For this tutorial we will only work with the shirt since the same steps work for the skirt and the socks. Make sure that the Object is the shirt and the Material is Cloth1 as shown below. The Diffuse Color is gray which is giving the shirt a gray appearance shown above. Click on the Diffuse Color box and change it to the color that you want. For this tutorial we will use blue. The Diffuse Color will determine the color of the shirt.

We must also change the Highlight color to Black. Depending on the resolution of your computer the color may already appear to be black. On higher screen resolutions, the color is actually a dark gray that creates the highlights that adds a plastic look to the shirt. If you take a normal cloth shirt then you'll see that your highlights are not shiny white. In order to change this we will change the Highlight color to black.

Your shirt is now ready for use. We have made a few renders using our new material settings and the same light settings that we used in our Before Picture at the beginning of this tutorial. We also used different colors of the shirt using different colors so that you can see how other colors look with the new settings.