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
Kumoricon 2014 (so far):
-Sora (Kingdom Hearts 2)
-Serena (Pokemon Y [It's the one I have lol])
-Akaito (Vocaloid. Black & Red Ver.)