nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqesha7f4m7zfc7rlyg7ufeysw8prq76f6edjr7ajh686raeeg5gsq2292y4 (nprofile…92y4) Yes, as others have said, these are the "eyes" of hook-and-eye fasteners.
My summer job while in college was working for L.M. Rabinowitz and Company... which at one time was the world's leading manufacturer of hook-and-eye-based fasteners for bras, girdlew, and corsets.
My floor made 50% of the world's bra straps. Hell, I made over 6 million bra straps myself, running a bank of 6 sewing machines in a Norma Rae-like factory in New York's garment district over the course of three hot, humid summers in the 1970s.
Piece work: you got paid by the number of straps you produced. So you learned to change bobbins in 7 or 8 seconds and rethread a sewing machine in under a minute.
Anyway, that was old history. Rabinowitz was shortsighted. In the late 1970s, Rabinowitz had the opportunity to go into Velcro... and they turned it down. That was that. Rabinowitz is no more.