I am not sure if these would be clothes you could purchase or wear actually, they might just be articles of clothing that you could create and then possess, but:
Cargo pants that increase storage capacity, and come with a jar of mayonnaise. Actually I guess these would be a special kind of storage container.
Bedazzled Jacket (combo of crystals and denim jacket) that positively effect mood and energy—or maybe it actually gives off light in a really dark cave.
Pants That Make Your Butt Look Good: When you wear these, all available quoins in the street are magnetically attracted to you, and jump into your quoin accounts when you walk down the street.