Tales of Vesperia has them. Tales of Graces F has them. When it launches, Tales of Xillia will offer downloadable school uniforms, as well. A new scan of the upcoming Tales RPG shows the cast in their school outfits; Jude looking preppy, Milla looking spunky, Alvin a professor, and so forth.
No date or price has been set for the costumes. They will release on the PlayStation Store post-launch.
Tales of Xillia will release on PlayStation 3 in Japan on September 9, 2011.