On this page of the Spider-Man Miles Morales guide, you will learn how to unlock the Purple Reign Suit.
To access this costume, you must find all the sound samples and complete the Back to the Beginning side mission. Unlocks the vision modifier RECLAIMER, which restores 1 piece of gadget ammo after performing a silent elimination with a melee attack.
The Prowler-style outfit, along with the purple and green color scheme. It even has little green claws on the toes! A guitar is unfortunately not included with the kit.