personally having gone to over 200 concerts myself..i wear normal clothes to any concert..but then again vocaloid isnt the style of music i go and see..cosplay may work for this..since its more along the same lines..but dont wear one if u think at all it may rip..unless u wanna sew it back up..
Cosplay DA Regular DA
-Fate Testarossa (Mahou Shojo Lyrical Nanoha A's) ~90%-
-Ryouko Ookami (Ookami san and her 7 companions) ~75%
-Amy Sorel (Soul Calibur) 25%-