First we will start by doing some quick sketches.
*I will be using sketchbook pro & photoshop.
-Usin the flood fill on sketch book pro, create a background.
-I'm using a warm grey - lock the layer and create a new one.
-Google "pencil skirt pattern" and download an image, Go to File -> Add Image -> bring the image and set the layer to multiply.
I edited some parts to fit my design (lock the layer) create a new one (color) and reorder them so it is layer #1 (background), layer #3 (color), layer #2 (skirt pattern).
Now lets work on the "color" layer I'm using the airbrush to fill in a dark purple color, and to create some shadows. Then i grabbed my paintbrush and added some highlights with a light purple (almost white) color.
work only on the color layer; This is really important since you don't want to damage the pattern.
*I noticed that the background was too dark, so I went back and changed it to a lighter color.