Trousers comprising a leg region, a seat region and at least a pocket, wherein the pocket comprises: an upper edge, a lower edge, opposite the upper edge, a first and a second lateral edge (4, 5), opposite one another, each lateral edge (4, 5) being interposed between the lower edge and the upper edge; a first portion, exhibiting a first edge defined by a first terminal tract, a second terminal tract and a median tract, and a second portion, exhibiting a second edge defined by a first terminal tract, a second terminal tract and a median tract, defining a de-assembled configuration, the first edge and the second edge facing one another; a sewn seam, defining an assembled configuration of the pocket, arranged along the first edge and the second edge; the first portion and the second portion exhibiting a flat development such that if the first edge and the second edge are arranged on a plane in reciprocal contact at least at a contact point, at least two first terminal tracts (8a, 9a) are separated from one another by a separation zone which widens from the contact point towards a lateral edge of the pocket, the seam facilitating a union of the first portion to the second portion via superposing of the first edge with respect to the second edge at the contact point, and a nearing of the first edge with respect to the second edge, at the separation zone, in order to give the pocket a curved three-dimensional conformation, characterized in that the pocket is applied to the seat region of the trousers, such as to be superposed, in use, on a buttock region of a person wearing the trousers, and wherein the seat region of the trousers comprises a cut, defined by a vertex, a lower flap and an upper flap; the flaps (19, 20), which are reciprocally divergent starting from the vertex, being connected, by superposing of the upper flap on the lower flap, by means of a second sewn seam, and wherein the pocket is applied to the seat region of the trousers, superposing the seam on the second seam; the seam defining an ideal extension of the second seam. an upper edge, a lower edge, opposite the upper edge, a first and a second lateral edge (4, 5), opposite one another, each lateral edge (4, 5) being interposed between the lower edge and the upper edge; a first portion, exhibiting a first edge defined by a first terminal tract, a second terminal tract and a median tract, and a second portion, exhibiting a second edge defined by a first terminal tract, a second terminal tract and a median tract, defining a de-assembled configuration, the first edge and the second edge facing one another; a sewn seam, defining an assembled configuration of the pocket, arranged along the first edge and the second edge; the first portion and the second portion exhibiting a flat development such that if the first edge and the second edge are arranged on a plane in reciprocal contact at least at a contact point, at least two first terminal tracts (8a, 9a) are separated from one another by a separation zone which widens from the contact point towards a lateral edge of the pocket, the seam facilitating a union of the first portion to the second portion via superposing of the first edge with respect to the second edge at the contact point, and a nearing of the first edge with respect to the second edge, at the separation zone, in order to give the pocket a curved three-dimensional conformation, characterized in that the pocket is applied to the seat region of the trousers, such as to be superposed, in use, on a buttock region of a person wearing the trousers, and wherein the seat region of the trousers comprises a cut, defined by a vertex, a lower flap and an upper flap; the flaps (19, 20), which are reciprocally divergent starting from the vertex, being connected, by superposing of the upper flap on the lower flap, by means of a second sewn seam, and wherein the pocket is applied to the seat region of the trousers, superposing the seam on the second seam; the seam defining an ideal extension of the second seam.