Adjustable shoulder strap, its manufacturing method, and brassiere strap adjustment ring

19:

• Manufacturing method of an adjustable shoulder strap, comprising steps:
• A. Stitching and securing one end of a strap body to a fixed column of a brassiere strap adjustment ring on the rear side of said brassiere strap adjustment ring using stitching;
• B. Passing the other end of said strap body from said rear side, on one side of said fixed column, through a frame body to the front side of said brassiere shoulder strap adjustment ring;
• C. Passing the other end of said strap body from said front side, on the other side of said fixed column, through said frame body to said rear side.

21:

• An adjustable shoulder strap, comprising:
• a strap body comprising a fixed end and a connecting end opposite to said fixed end;
• a brassiere strap adjustment ring, comprising a frame body and a fixed column horizontally placed in said frame body to form a first guiding hole and a second guiding hole, wherein said fixed column, which is located between said first guiding hole and said second guiding hole, has a plurality of threading holes;
• and
• a stitching which connect said fixed column with said fixed end of said strap body, wherein said fixed end of said strap body is stitched and secured to said fixed column on one side of said brassiere strap adjustment ring by threading through said plurality of threading holes and said first guiding hole with said stitching, wherein said stitching comprises a plurality of first stitching thread portions each passing through one of said plurality of threading holes and said first guiding hole, and a second stitching thread portion between two adjacent first stitching thread portions of said plurality of first stitching thread portions, wherein each said second stitching thread portion passes through two adjacent threading holes of said plurality of threading holes;
• wherein said connecting end is adapted to sequentially pass through said second guiding hole and said first guiding hole of said frame body.