In celebration of the premiere of the Sword Art Online Ordinal Scale movie it appears that Sword Art Online: Hollow Realization will be getting some free DLC costumes. The costumes will be for Asuna and Kirito, but will be usable on any other character expect Klein and Agil for the moment, but the development team is working to resolve that issue.
The costumes will be available on the PlayStation Store February 21st.