A real-time motion capture system and garment includes a wearable activity monitor that may be a pair of denim jeans. The wearable activity monitor includes multiple sensors such as accelerometers, gyrometers, magnetometers disposed within the seams of the garment. A microprocessor and wireless transmitter) communicate the motion data to an external device. The microprocessor and wireless transmitter may be included within one of the seams. An elastically stretchable ribbon or a flexible ribbon such as a kapton ribbon or a ribbon formed of textile, electrically couples the sensors and microprocessor and is also disposed inside the seams and the components within the seam are coated with a waterproof coating. The external device can store the data or display and analyze the data real-time, and may communicate the data to a further electronic device.