Was working on a similar problem, to fetch color of cloths from images(including models and background) in an e-commerce website. This implementation gives the best result so far.
Depending on the size of the object you are trying to segment relative to the image, you can adjust the size of superpixels. To segment parts such as clothes you can set large superpixel size by enabling developer option on top right corner. You can also see superpixels rendered to understand which size gives best results. This method can perform even approximate non-interactive segmentation.