Instructions
Press the "Right" button on the directional pad to bring up the game's Inventory menu.
Press the "Right" button on the directional pad a second time to open the Clothes menu.
Move your cursor over the shirt icon and press the "A" button. Move your cursor over the shirt that you want to change into and press the "A" button to change into the shirt.
Move your cursor over the pants icon and press the "A" button. Move your cursor over the pants that you want to change into and press the "A" button to change into those pants.
Move your cursor over the shoes icon and press the "A" button. Move your cursor over the shoes that you want to change into and press the "A" button to change into those shoes.
Press the "+" button to save the changes.