Hi Michael,
since it is a textile, formal deviations are not important.
I'm on the right track and completely satisfied with the way it is.
The loop has contact at the "origin" because it is actually ultrasonically welded together there. To create a loop.
What is now still my problem...the curves I have rounded with the fillet command. However, the circular version is not pretty in the rendering. So I thought of a G-Blend. But it only works for the upper rounding. The lower one shoots out of bounds with G2.
Question: Where could be the error for shooting beyond?!



Attached the model.