BF single strap sports bra and leggings set

This set of bra and leggings is composed of 75% nylon, 25%spandex.  It is knitted fabrics, making it 4-way stretch, that is, up and down, left and right. There is usually either 2-way or 4-way stretchiness over fabrics knitting since the stretchiness is relatively working either horizontally or vertically.