Today, SEGA announced that the Retro Diner Style Amy Costume for Sonic Superstars is now available on PlayStation 5, PlayStation 4, Xbox Series X|S, Xbox One, and the Nintendo Switch family of systems, as well as digitally on PC.
The Retro Diner Style Amy Costume is free for all Sonic Superstars players and features a new outfit for Amy to wear that brings a fun retro vibe to the beautiful Northstar Islands. The costume can be equipped during character selection by selecting Amy and then pressing the left or right button while playing Story Mode. Sonic Superstars is available both digitally and physically.
Source: SEGA