This is pattern #4 in the book “75 Exquisite Trims in Thread Crochet.” Instructions on page 29. Featured on page 9 of the Trim Selector.

Finished width: 1 inch (25mm)
Thread required: 2 yards per inch of trim (0.7 m per cm of trim)

All pattern samples in this book are made with size 10 thread and a size 7 (1.65mm) crochet hook.