In this paper, a flexible stretchable pressure sensor that can be combined with clothing is designed. Due to its excellent flexibility, it is no longer limited to conventional uses when combined with fabrics. This wearable flexible stretchable pressure sensor is easy to process and low in cost and can participate in human motion monitoring accurately, flexibly, and variably. The sensors show different performances when they are made of different flexible materials, microstructures, and processing technologies. They have ideal biocompatibility and adaptability and have considerable application prospects. Moreover, multiple sensors can be applied to various parts of the human body to measure the angle of the human body. Angle monitoring in the sagittal plane, coronal plane, and horizontal plane may also be realized in the future, In this report, the performance of the sensor integrated into the elastic tights was tested, and then the actual application and independence of the sensor clothing were demonstrated by measuring the angle of the hip joint in the sagittal plane. Finally, when the sensor clothing was worn, the synchronous gait measurement was carried out on the treadmill with the dynamic capture, and then the captured data was processed to obtain the human motion data. Through comparison with the dynamic capture system, To detect the initial actual performance of the sensor and characterize the defects in wearing measurement.