According to Persona Channel, Persona 5 Royal, which will debut on PC and Xbox platforms in October, will bring costume and music DLC;

Accordingly, in these new versions of the game, 45 pieces of DLC will be offered to players completely free of charge. While these are mostly costume DLC, it’s still a nice gesture in terms of variety, and I don’t think anyone will complain because it’s free.

The list of DLCs that will be included in Persona 5 Royal is as follows:

Persona 4 Costume & BGM Special Set
Persona 3 Costume & BGM Special Set
Persona 2 Costume & BGM Special Set
Persona Costume & BGM Special Set
Shin Megami is Tensei. .. .. Costume & BGM Special Set
Persona 4 Dancing All Night Costume & BGM Special Set
Persona 4 The Ultimax Costume & BGM Special Set
Shin Megami Tensei IV Costume & BGM Special Set
Catherine Costume & BGM Special Set
Orpheus & Orpheus / Thief God Set
Izanagi & Izanagi / Thief God Set
Thanatos & Thanatos / Thief God Set
Magatsu Izanagi & Magatsu Izanagi / Thief God Set
Kaguya & Kaguya / Thief God Set
Ariadne & Ariadne / Thief God Set
Asterios & Asterios / Thief God Set
Tsukiyomi & Tsukiyomi / Thief God Set
Messiah & Messiah / Thief God Set
Persona 5 The Royal Recovery Item Set
Persona 5 The Royal Skill Card Set
Persona 5 The Royal Plain Clothes / Uniform Costume Set
Persona 5 The Royal Phantom Thief Marked Morgana Car Sticker
Persona 5 The Royal Swimsuit Costume Set
Persona 5 The Royal Persona 20th Anniversary Morgana Car Sticker with Anniversary Logo
Persona 5 The Royal Maid & Butler Costume Set
Persona 5 The Royal Christmas Costume Set
Persona 5 Dancing Star Night Costume & BGM Special Set
Persona 5 The Royal Belbedroom Costume & BGM Special Set
Persona 5 Dancing Star Night Featherman Costume & BGM Special Set
Shin Megami Tensei DEEP STRANGE JOURNEY Costume & BGM Special Set
Persona 5 The Royal Jersey Costume Set
Izanagi Ogami & Izanagi Ogami / Thief God Set
Orpheus & Orpheus / Thief God (f) Set
Athena & Athena / Thief God Set
Persona 5 The Royal Exploration Assistance Pack
Persona 5 The Royal Battle Help Pack
Persona 5 The Royal Kasumi Yoshizawa Costume Numbering Package
Persona 5 The Royal Kasumi Yoshizawa Costume MEGAMI Package
Persona 5 The Royal Kasumi Yoshizawa Costume Extra Package 1
Persona 5 The Royal Kasumi Yoshizawa Costume Extra Package 2
Persona Raoul
Persona 5 The Royal Challenge Battle Extra Set
Persona Q2 New Cinema Labyrinth Costume & BGM Special Set
Persona 5 The Royal Challenge Battle Best Customer FULLMOON
Persona 5 The Royal Challenge Battle Best Customer FOGGYDAY