An embodiment of the invention discloses elastic fabric and an elastic body fitting garment. The elastic fabric comprises a concave-convex zigzag cross section structure, convex folds of the concave-convex zigzag cross section structure are connected through needle stitches in string mode, and tightness of the needle stitches is adjustable. Concave folds of the concave-convex zigzag cross section structure are attached to skin. The elastic fabric and the elastic close-fitting garment use a concave-convex zigzag cross section fabric structure formed by weaving hollow fibers and use the concave-convex zigzag cross section structure for constructing a three-dimensional air channel, enable skin experience to be comfortable, and improve functions of body warm keeping and moisture discharging. For different fabric structures in the elastic close-fitting garment, no extra suture lines or adhesive is used to splice the structures. Advanced seamless once-forming technology is adopted to achieve a traceless splicing effect for multi-structure weaving, and wearing comfortableness is further improved.