Harleys are the most well-known motorcycle in the United States. The have an aura of 'coolness' about them, so if you are on one, most people will look at you as being a 'cool' person. That's the case with the Harley Girl. She's cool, but she wants to dress up for the bike ride. Click the motorcycle tires at the top to get different options of clothing, accessories, etc. When you click one, a sub-menu will pop up and you can simply left click on the different items to have them applied to the Harley girl. Keep going until you're satisfied, then you should hit 'Done'.