The wardrobe is one of the tabs at the top of the screen. When clicked on, you can change what you're wearing. There is a simple picture of what your character is wearing on the left. When you spawn you have a simple brown t-shirt and simple brown pants on. Click on your clothing to take it off. On the right, there is all the clothing that is in your inventory. Click 'wear' to equip it. There must be nothing on the body part that clothing piece is supposed to go on to equip it. Using the wardrobe you can customize your character a little and increase its health.