A wearable garment 360 is provided comprising an attached sensor module 310, the sensor module comprising an oscillation sensing element 318, wherein a processor processes the measurement data provided from the sensor module to provide an index value representative of the support provided by the wearable garment. In embodiments the oscillation sensing element is an accelerometer, such as a 9-axis motion sensor, alternatively it could be a piezoelectric element configured to deform in response to the deformation of the fabric of the wearable garment. In embodiments the wearable garment is a sports bra. The wearable garment may further comprise a wireless communication unit (314, figure 2).
