A Narrow Waved Insertion

This pattern, described as an "insertion suitable for trimming underclothing", is from "The Home Art Crochet Book" edited by Flora Klickmann. The book is available freely at The Antique Pattern Library. The edging is found on page 15 Section II, Uncommon Insertions.

I reproduce the original antique pattern here and provide a version I have edited for the modern crocheter. For the sample shown, I used crochet cotton thread size 8 and steel hook size 1.2mm.

A Narrow Waved Insertion
UK crochet terminology

Make a ch of the required length (multiples of 12+1) + 5 ch for turning.

Row 1: Tr in 6th ch fr hook (makes tr, ch 1, tr), *ch 2, sk 2 ch, tr in next ch, rep fr * across, end with ch 1, sk 1 ch, tr in last ch. Ch 5, turn.

Row 2: Dc in first 1-ch sp, *ch 5, sk next 2-ch sp, long tr in next 2-ch sp, ch 5, long tr in same 2-ch sp, ch 5, sk next 2-ch sp, dc in next 2-ch sp, rep fr * across, end with ch 2, tr in last st. Ch 5, turn.

Row 3: Sk 5-ch turning ch, dc and first 2 ch, *tr in next 3 ch, tr in next tr, tr in next 3 ch (total of 6 tr), ch 5, tr in last ch worked, tr in next 2 ch, tr in next tr, tr in next 2 ch (total of 6 tr); sk next 2 ch, dc and next 2 ch, rep fr * across; end with ch 2, tr in last st. Ch 5, turn.

Row 4: *Miss first tr, tr in each of next 5 tr, ch 5, sk 5-ch sp, tr in each of next 5 tr; rep fr * across, end with ch 2, tr in last st. Ch 5, turn.

Row 5: *Sk next 2 tr, 1 long tr in third tr, ch 5, dc in 5-ch loop, ch 5, rep fr * across;  end with sk next 2 tr, 1 long tr in third tr, ch 2, tr in last st. Ch 4, turn.

Row 6: Tr in first sp, *ch 2, tr in next sp, ch 2, tr in same sp, rep fr * across; end with ch 2, tr in last sp, ch 2, tr in last st.

Finishing:

Finish both sides with a row of 3 dc in each sp.