I'm guessing you're into Vocaloid, judging by your icon-- why not do a Vocaloid group? The school uniform-style outfits wouldn't be too bad for a beginner, since you could use a pattern for essentially all of it.
There are also plenty of other outfits that you could do in a group, like Love is War
, Secret Police
, or Meltdown
, if the traditional ones aren't what you're going for.
Best of luck!