S-shaped fastener for back of bra

A fastener for a bra, and the fastener comprising:

• a first fastening part for connecting to a first end of the bra and a second fastening part for connecting to a second end opposite to the first end of the bra;
• wherein the first fastening part comprises:
• a first bottom plate and a first panel partially disposed on a surface of the first bottom plate, and a first insertion notch is defined between the first bottom plate and the first panel;
• wherein the second fastening part comprises:
• a second bottom plate and a second panel partially disposed on a surface of the second bottom plate, and a second insertion notch is defined between the second bottom plate and the second panel;
• wherein when the first fastening part is connected to the second fastening part, the first fastening part and the second fastening part are mutually embedded through the first insertion notch and the second insertion notch;
• wherein the first bottom plate defines an L-shaped lower notch, a side surface facing towards the first insertion notch of the first panel is inverted S-shaped, and the first insertion notch is a gap between an upper part of the side surface of the first panel and a vertical surface of the L-shaped lower notch;
• wherein the second bottom plate defines an L-shaped upper notch, a side surface facing towards the second insertion notch of the second panel is inverted S-shaped, and the second insertion notch is a gap between an upper part of the side surface of the second panel and a vertical surface of the L-shaped upper notch;
• wherein at least one back hook is disposed at an edge facing away from the first panel of a bottom surface of the first bottom plate, and an edge facing away from the second panel of the second bottom plate defines at least one fastening hole;
• and
• wherein each back hook of at least one back hook defines an opening facing to the right, an opening of the first insertion notch faces downwards, and an opening of the second insertion notch faces upwards.

An S-shaped fastener for the back of a bra, and the S-shaped fastener comprising:

• a left fastening part for connecting to a left end of the bra, and a right fastening part for connecting to a right end of the bra;
• wherein the left fastening part comprises:
• a left bottom plate, a left panel overlapped on a surface of the left bottom plate, and a left insertion notch defined between the left bottom plate and the left panel;
• wherein the right fastening part comprises:
• a right bottom plate, a right panel overlapped on a surface of the right bottom plate, and a right insertion notch defined between the right bottom plate and the right panel;
• wherein when the left fastening part is connected to the right fastening part, the left fastening part and the right fastening part are mutually embedded through the left insertion notch and the right insertion notch;
• wherein the left bottom plate defines an L-shaped upper notch, a left side surface of the left panel is S-shaped, and the left insertion notch is a gap between an upper part of the left side surface and a vertical surface of the L-shaped upper notch;
• wherein the right bottom plate defines an L-shaped lower notch, a right side surface of the right panel is S-shaped, and the right insertion notch is a gap between a lower part of the right side surface and a vertical surface of the L-shaped lower notch;
• wherein a first arc convex plate is disposed on a surface of the left panel, and an edge of the first arc convex plate is located in the middle of a left side edge of the left panel;
• and a second arc convex plate is disposed on a surface of the right panel, and an edge of the second arc convex plate is located in the middle of a right side edge of the right panel;
• wherein a first raised reinforcing rib is disposed on an upper surface of the left panel;
• and a second raised reinforcing rib is disposed on an upper surface of the right panel.