Clothes!

Right.... You probaly already know this...but just in case...
You could go to Female Clothing/Shoes on the Shops at the top of the screen or get free clothing at The Clothing Rack.
Now if you go to your wardrobe it won't be there because you haven't added the piece of clothing, so go to your Items and click on the clothing.
Then press Add Clothes to add it to your wardrobe, So then go to Dress Up and wardrobe and it will be there!

The person that helped me was: Sobolan (Queen of Giant Turnips)!