We present BreathClip, a lightweight, clip-on respiration sensor that enables accessible, embodied interactions based on respiration. The sensor captures subtle torso movements using an IMU and streams breathing data wirelessly in real time. BreathClip attaches easily to everyday clothing with either a clip or magnet, avoiding the discomfort and setup challenges of commonly used belts. With low-cost off-the-shelf hardware, and open-source software, it lowers the barrier for integrating live breathing signals into interaction design. Inspired by the theme of Digital Diversity, we demonstrate an interactive multi-user demo that visualizes each participant’s unique breathing pattern as an evolving digital trace, highlighting how diverse inner signals can shape shared interactive experiences. BreathClip enables harnessing physiological signals for richer, more versatile interaction design.