I've only worn Decora out in public a few times, but never at school. You are much braver than I. xD
I do remember once I wore it out when my friend was visiting and we walked over to our other friend's house... It wasn't exactly the best experience. : As we crossed the bridge, a few people rolled down their windows and screamed bad words at us, and on the way back someone rolled down their window and took a picture. Maybe it was just because of the floppy pink bunny hat. xD;
It doesn't really stop me from doing it occasionally when I'm by myself or riding my bike somewhere, because I like the way it makes me feel to be dressed like that. It makes me feel creative and cute. :D
I haven't done it do school so much, I water my clothing down A LOT when I go to school, but it's slightly reminiscent of decora. xD; I remember in my drawing class I brought Fruits as a reference book since we were talking about color, we actually had a class discussion about decora and lolita, and I actually got into a discussion about it with one of our models (who is interested in that, and liked Goth Loli). xD She encouraged me to do it to school one day, and I think I might, if I can find a day a wake up early enough to do my hair and get all those hair clips in.