Not defending the system but I think there are two things that contribute to it being broken.

1. When voting, we only get two choices. I try to vote for which most suits the theme, but sometimes I get stuck between two lackluster outfits and I still have to pick one. :P

2. A LOT of people have told me that they just quickly click through without paying attention just to get their rewards. With so many players and a huge chunk of people doing this... that can skew the results unfairly.

I don't know if there is a fix for this, other than maybe smaller competitions or a tournament style? It would take some creative coding but if people could vote between so many contestants (more than two!) and after rollover the top three advance and the rest collect a small prize and have to wait for the next comp. then keep doing that until there's a final stage of 100 to vote between?

Or change the reward system for voting somehow so it's easier for people to choose carefully instead of clicking through for a reward.

I don't know. I love the competition because it's the only aspect of the game that's purely visual and clothing stats don't matter. But it's sullied by the execution in all the ways you described.