Successfully complete the indicated task to unlock the corresponding clothing at the "My Closet" menu in the Rock Shop.

Ultimate Goth outfit: Complete the Impossible Drum Challenge.
Ultimate Metal Outfit: Complete the Impossible Vocal Challenge.
Ultimate Punk Outfit: Complete the Impossible Bass Challenge.
Ultimate Rock Outfit: Complete the Impossible Guitar Challenge.
Rearview Chaps: Complete The Final Band Challenge as a male.
Worn in the USA Chaps: Complete The Final Band Challenge as a female.