You can easily change the color of the clothing item by changing the "Diffuse Color" in the material room.
Try to change the diffuse color for the material zones (dress, hem, neck trim, arms trims, sleeves trims and sleeves) to an other color.
Try also to give the material zones different diffuse colors.
You can also change the specular color of the material zones to a similar color as the diffuse color you were choosing for a different result.
Example: Use black for diffuse color and a dark gray for specular color.