Three widths of cotton net I dyed flesh, hand joined with vintage thread, and now 4 rows of 8m each of lace, box pleating at the tallest part of each scallop. So around a 2:1 ratio of lace to fabric..
The dress I salvaged the lace from appears to have salvaged the lace off an even earlier dress as the flounces on that had many more joins than needed and some pieces were really tiny. So I suspect the lace is indeed 50s or earlier.