This set includes the following DLC:
- Van's Swimsuit
- Agnès' Swimsuit
- Feri's Swimsuit
- Aaron's Swimsuit
- Risette's Swimsuit
- Quatre's Swimsuit
- Judith's Swimsuit
- Bergard's Swimsuit
- École de Aramis Uniform Set

More details on the official game page of Trails through Daybreak - Costume Set ...