Double thread-stitching tape.
In the production of thread-stitching fabric, a synthetic thread is inserted, which does not allow it to tear, stretch and does its job at the expense of these threads.
Then cut into a braid in the oblique direction and in the fractional direction.
Double braid in the oblique direction is used to bend the bottom of the product, sleeves, trousers, and can also be used to fix the allowances of the neck of the collar and the lining.
The shared double thread-stitching braid is used in places where the direction of the main part is cut according to the shared one, for example, for coupling (fixing) two parts of the side and the shelf.
Personally, I am against the violation of the technology of cutting the fabric of the top and the adhesive, they must be cut in the same direction, the same is the case with a double fastening tape made of thread-stitching doublerine.
Conclusion: a double ribbon made of thread-stitching doublerine is a good assistant in sewing skills, but I recommend using it in those places, observing the technological requirements of cutting.