which illustrates the fourth stitch type 40 the first covered yarn f 1 the third textured yarn f 3 the flat yarn f 5 and the textured yarn f 7 are each kept on two rows one column in every two forming stitches skippings arranged in staggered rows complementarily the extensibility of each stitch type 28 36 38 40 in a transverse direction in the sense of the yarn is determined by the number of stitches per unit area 42 the greater the number of stitches is the higher the transverse elastic extensibility of the stitch tends to be referring to fig3 to 6 the first stitch type 28 and the second stitch type 36 include each thirty six stitches per unit area 42 the third stitch type 38 includes fifty six stitches per unit area 42 and the fourth stitch type 40 includes forty eight stitches per unit area 42 the high number of stitches of the fourth stitch type 40 allows to make the third central portion 34 a 34 b of each cup 12 a 12 b opaque thus hiding the chest the vertical elastic extensibility characteristics relating to different stitch types 28 36 38 40 are described afterward the first stitch type 28 has the lowest vertical extensibility which is for example comprised between zero and twenty percent and which is preferably equal to ten percent or even zero percent relative.