To create clothing designs in Illustrator, start with a simple sketch and once you have the rough layout, start drawing out features using the pencil tool. This is an important tool that will help you create a nose and mouth. Using the Swatches panel feature, fill in the colour of your sketch. Make sure that the sketch colour easily blends with the background colour of the canvas. Once you have the basic layout sketch of your model, using the pen tool, draw the sleeves, add angled points, and drag the sleeves to create curves. Finish off the path by clicking on the original anchor point from where you started your drawing. When you are done with drawing sleeves, using the selection tool choose and fill the sleeves with colorful patterns from the swatches panel. Like the sleeves, draw the rest of the clothing and hair using pencil and pen tools. The rectangle tool will help you draw the hair ties.