To provide spats 1 covering waist part and lower extremities and assisting the exercise or standing posture of a wearer by improving the muscle power of the waist part and lower extremities.

The spats comprises a side expanding and contracting part 11 having a higher expanding and contracting property in left and right direction as compared with that in up and down direction, and the side expanding and contracting part 11 comprises at least a first side expanding and contracting part 11a covering at least the straight muscle of thigh and an upper region of vender of musculus vastus lateralis and musculus vastus medialis and a second side expanding and contracting part 11b covering at least musculus gluteus medius and the upper region of vender of musculus biceps femoris and semitendinous muscle.