So let's say I have a costume and I want to have some speakers hooked up to a MP3 player inside the costume that can loudly project the sound while I dance. The speakers would have to be very thin so that they wouldn't bulge out of the costume, and they would have to be powerful enough to project sound through the costume.Any ideas? I'd prefer something that doesn't cost too much, but I do need fairly good quality to make this effective.