In recent years, Wearable Devices (WDs) have gained growing interest in detection of human vital parameters, from simple activity trackers to more complex systems capable of providing active interaction with the human body. This is also due to the spread of IoT systems, which allow the efficient data processing provided by various devices. Despite the development of even smaller and more powerful rigid electronic devices, the spread of stretchable sensors has attracted attention because of their skin-like characteristics, their multiple application fields and their environmental impact. A wearable device using flexible and stretchable sensors, based on strain-response mechanism, to monitor breathing rate is designed and analyzed in this research study.