A measurement system (3) for a wearable item (2) comprising a pressure sensing system including a plurality of capsule chambers (22) each filled with a fluid, and pressure sensors (28) connected to the capsule chambers configured to measure a variation in volume due to pressure applied on an outer wall of the chamber, the measurement system further comprising an inertial measurement unit (7) and an electronic control system (8) receiving measurement signals from the pressure sensors (28) and inertial measurement unit (7) and for processing said signals to compute parameters related to an impact.