This set includes the following DLC:
- Glasses Set
- Sunglasses Set
- Sun Visor Set
- Mask Set
- Backpack Set
- Inner Tube Set
- Costume: White Rabbit
- Costume: Dog
- Costume: Fox
- Costume: Cow
- Visual Ambience Set
- Character Xipha Cover Set
- Illustrated Xipha Cover Set

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