to the retaining loops and a resulting woven pin seam would obviously not be satisfactory at attempt to equalize the loop lengths by forcing the warp crimps to conform would either cause unacceptable distortion in the reconstituted area of added wefts or such gross distortion of the woven back strands that it would actually be impossible to continue weaving them into the added weft strands in fig3 the warp strands are shown to have been selected to form pairs of pintle loops p extending from the ends of the fabric retaining loops are looped around the last added weft 9 39 between the pairs of pintle loops supplementary flexible strands x and y are interwoven around the pairs of pintle loops from top side to bottom side of the fabric in such a way that they cross each other between the pairs of pintle loops and underlie the retaining loops where they cross as shown the flexible strands in this way bind the pairs of pintle loops together and hold them in extended tandem alignment according to the invention when the warp strands that are to be looped and re woven into added weft strands are flattened they will then be found to adapt themselves to the crimp pattern of the reconstituted fabric thus formed regardless of their inherent crimp configuration and the lengths of the loops may be equalized as shown in the drawings the flattened monofilament strands of the present invention would have a substantially rectangular cross section with the long axis.