Dressdorm can create every outfit any character has ever needed, and presumably can be used for literally any outfit. With it, Peke has changed into school uniforms, gym uniforms, alien uniforms, swimsuits, bikinis, dresses, lingerie, etc. It's also allowed Peke to change into what usually isn't considered to be clothing material as long as it helps make up the outfit, such as frosting.
Only seen when Rito took over Peke's body and lost control, Dressform can also be used to throw projectiles that change the outfit of whoever they come into contact with. The outfits that the projectiles create seem to be mostly random, but at least somewhat influenced by who sends them (i.e., Rito was highly aroused at the time he threw his projectiles, so those who were hit by the projectiles were given revealing new outfits).