Example of a DIY low cost, easy to build, wearable animatronic effects prop on a "T" shirt that you can build. Fly Prop available as KIT or ready to wear item.
Video example and wearable animatronic shirt prop by Wizard-Devices.
How To - Wearable Animatronic DIY project book, animatronics, electronic controllers, mechanical assembly parts, animatronic kits available from Blue Point Engineering. (less info)