A durable underwear brief panty adapted to accommodate an absorbent component, comprising: a front waist portion with a front waist edge and left and right front leg opening edges; a rear waist portion with a rear waist edge and left and right rear leg opening edges; a crotch portion with a forward portion meeting the front waist portion, a rearward portion meeting the rear waist portion, and left and right crotch leg opening edges, and a minimum width of 8.0 cm, more preferably 9.5 cm, and still more preferably 11.0 cm; and left and right hip side portions joining the front waist portion to the rear waist portion and thereby forming a waist opening with a waist opening edge comprising the front waist edge and the rear waist edge, and left and right leg openings each comprising a respective left or right front leg opening edge, crotch leg opening edge and rear leg opening edge; wherein, when the panty is in an opened configuration in which the front waist portion and rear waist portion are separated at the hip side portions, the panty has a longitudinal axis and a lateral axis, with an intersection thereof, the intersection occurring in the crotch portion; and wherein the crotch portion exhibits: a crotch longitudinal Elongation of 5 percent to 100 percent as measured by the Elongation measurement method described herein; a crotch lateral Elongation of 50 percent to 200 as measured by the Elongation measurement method described herein; and a crotch lateral Tensile Modulus of 2 gf/mm to 20 gf/mm as measured by the Tensile Modulus measurement method described herein; wherein the crotch portion comprises at least distinct wearer-facing and outward-facing layers (130a, 130b) of knit material at the intersection between the longitudinal and lateral axes; and wherein the at least two layers (130a, 130b) of knit material define an open envelope structure in the form of a pocket having an insertion/withdrawal opening and a pad containment space at least partially present in the crotch portion, between the at least two layers (130a, 130b) of knit material. a front waist portion with a front waist edge and left and right front leg opening edges; a rear waist portion with a rear waist edge and left and right rear leg opening edges; a crotch portion with a forward portion meeting the front waist portion, a rearward portion meeting the rear waist portion, and left and right crotch leg opening edges, and a minimum width of 8.0 cm, more preferably 9.5 cm, and still more preferably 11.0 cm; and left and right hip side portions joining the front waist portion to the rear waist portion and thereby forming a waist opening with a waist opening edge comprising the front waist edge and the rear waist edge, and left and right leg openings each comprising a respective left or right front leg opening edge, crotch leg opening edge and rear leg opening edge; wherein, when the panty is in an opened configuration in which the front waist portion and rear waist portion are separated at the hip side portions, the panty has a longitudinal axis and a lateral axis, with an intersection thereof, the intersection occurring in the crotch portion; and wherein the crotch portion exhibits: a crotch longitudinal Elongation of 5 percent to 100 percent as measured by the Elongation measurement method described herein; a crotch lateral Elongation of 50 percent to 200 as measured by the Elongation measurement method described herein; and a crotch lateral Tensile Modulus of 2 gf/mm to 20 gf/mm as measured by the Tensile Modulus measurement method described herein; a crotch longitudinal Elongation of 5 percent to 100 percent as measured by the Elongation measurement method described herein; a crotch lateral Elongation of 50 percent to 200 as measured by the Elongation measurement method described herein; and a crotch lateral Tensile Modulus of 2 gf/mm to 20 gf/mm as measured by the Tensile Modulus measurement method described herein; wherein the crotch portion comprises at least distinct wearer-facing and outward-facing layers (130a, 130b) of knit material at the intersection between the longitudinal and lateral axes; and