Designing garment patterns for a yoga suit is closely associated with body extension in yoga movement. This paper is to investigate the changes of body extension in yoga movement and to analyze the potential requirements for designing yoga suits in the future. Ten female yoga practitioners all with more than three-year constant exercise, are selected in conjunction with nine yoga asanas to experiment respectively with the basic and extreme body stretches. The results show that the body extension ratios of shoulder width (-23.93%), back length (-23.18%), front length (18.83%), and leg length (16.74%) are the four measures which have relatively significant body extension in yoga movement in the selected nine yoga asanas. Releasing the pressure from the areas with high body extension ratios requires to be taken into consideration when designing garment patterns for a yoga suit in the future.
