This costume uses a stethoscope as a microphone. It adds a nice muffled sound to the voice that varies as you move the stethoscope head around your throat.
I made multiples of these and used them for a group performance with Christina Georgiou. We invited people to wear one of three styles of costumes (the stereoscope being one) Christina conducted the participants by giving them rhythms and patterns to follow.
We performed this at the Friend_ship performance art festival - for further info check their site. www.friendship.lv