A method and sensor for testing and evaluating a sports bra for a level of support provided by the sports bra includes selecting a sports bra and removably attaching one sensor to the wearer of the sports bra. The wearer of the sports bra completes an exercise regimen corresponding to a support level indicated for the sports bra and the vertical, lateral and backward/forward movement of a bust supported by or within the sports bra is measured with the single sensor. A largest change in movement in each of the vertical, lateral and backward/forward directions is calculated to determine the level of support actually provided by the sports bra for accurate labeling of the support level of the sports bra for accurately informing consumer purchasing.