This free pattern originally published in:
Spool Cotton #109, A Bookful of New Edgings 
Nothing is daintier and more feminine than fine handmade lace edging your lingerie. Slips, panties, nighties – edge them for yourself – or edge them to make a trousseau type of gift.
Use
Clark's O.N.T. or J. & P. Coats Mercerized Crochet, sizes 50 to 80.
J. & P. Coats Tatting Cotton.
To begin, make a chain to measure slightly longer than length desired. 1st row: S c in 2nd ch from hook and in each ch across. Ch 1, turn. 2nd row: S c in each s c across. Ch 3, turn. 3rd row: * 2 d c in next s c, ch-4 p, 2 d c in same s c, skip 2 s c. Repeat from * across. Break off.
other patterns in leaflet: