The net edge pattern from Aunt Ellen's How-To Book on Needlework gives the edge for a handkerchief, including how to turn the corner. I had a copy of the booklet and used my copy of the instructions to create the sample edge.
It was only upon finishing it that I noticed the link to the section on netting does not include the instructions for the edging, so I have included the instructions here.
Pineapple Border Handkerchief Edge
You will need a handkerchief about 10 or 11 inches square or larger if desired. Mark the border in 1/8-inch intervals with a pencil, beginning at one corner and in the hem. Pin handkerchief to pillow by two corners to anchor for work. A number 22 netting needle was used and sizes 5 and 14 steel knitting needles. This is a very fine delicate edge.
Rnd 1: Start the first stitch on all handkerchiefs 3/4-inch from one comer. With a sewing needle, in lieu of a netting needle and approximately 24 inches or more of number 100 crochet thread, net plain, over a number 14 knitting needle through each mark completely around handkerchief.
Rnd 2: Over a number 14 knitting needle and using a netting needle, * net plain up to within 6 lps (loops) of the next corner, net 2 in each of these 6 lps, net 2 in each of the next 6 lps around the corner, repeat from * around. This adds fullness in 6 lps on each side of every comer. Do not put too much thread on the netting needle for the first two rounds.
Rnd 3: Over number 14 knitting needle, net plain all around.
Rnd 4: Over number 5 knitting needle, net plain all around.
Rnd 5: Over number 5 knitting needle, net 2 lps together all around.
Rnd 6: Over number 5 knitting needle, net 5 in each lp around.
Rnds 7, 8: Over number 14 knitting needle net plain.
Rnd 9: Over number 14 knitting needle, * sk (skip) the first lp (lp that divides the groups or pineapples), net 4 plain; repeat from * around. Each time a lp is skipped the thread should be made a little longer to allow the pineapple to come to a point.
Rnd 10: Over number 14 knitting needle, * sk a lp, net 3 plain, repeat from * around.
Rnd 11: Over number 14 knitting needle, * sk a lp, net 2 plain, repeat from * around.
I made the following changes to convert the instructions from rounds to rows :
Row 1: Start with an even number (I used 10 in the sample pictured above).
Row 2: Over a number 14 knitting needle and using a netting needle, * net plain (1 knot in each loop).
Rows 3-8: same as in the original instructions.
Row 9: Over number 14 knitting needle, * net 4 plain, skip the first loop (loop that divides the groups or pineapples); repeat from * around. End by netting the last 2 loops together.
Row 10: Over number 14 knitting needle, * net 3 plain, skip a loop, repeat from * around. End by netting the last 2 loops together.
Row 11: Without a mesh stick, net 1 knot in the first stitch; over number 14 knitting needle, net 1 knot in the next loop, * sk a lp, net 2 plain, repeat from * around. End by netting the last 2 loops together.