-never point out what you don't like/did wrong. Not only because you're drawing attention to a flaw, but judges don't like negativity.
I think this is the best advice. If something is messed up, or didn't turn out how you wanted it do, don't let them know. Worst case senioro, the judges would already see it, but they'll never say anything. I've never had a judge outright point out my flaws. Judges would never ever point out the flaws directly to your face. Like everyone said, that is just bad judging ethics. Focus on the positives of the costume and what you are proud of. Go in there with a sense of pride, and you'll do fine! Lots of luck to you!
Eren Jaeger (Attack on Titan)
Mitsuru Kirijo (Persona 3)
Saruhiko Fushimi (K Project)
Shadow Yukiko (Persona 4)
Suit! Sarutobi Sasuke (Sengoku Basara)
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