This is an amalgam of two patterns from an ancient book of shawl patterns I have from the 70s. The book said to use 4-ply, but I used a textured tweed-effect yarn, because that just happened to be the yarn I wanted to recycle. I used 6 x 50g balls of yarn (300g total) and that's the quantity of 4-ply suggested by the pattern. The fringe took a whole ball, the rest went into the shawl. The shawls in the book I was improvising from were smooth yarn, so I think this will suit whatever type of yarn you fancy, though a smooth yarn will give a much more open appearance.
Using a crochet hook that suits the gauge of your yarn (the book suggests a no. 6 crochet hook (5.00 mm) for the 4-ply) work 17 ch. then work in pattern as follows:
1st row. Work an extra 4 ch. to turn, miss these ch., (1 tr. into each of next 2 ch., 2ch., miss 2 ch. of foundation ch.) 4 times, 1 tr. into last ch., turn.
2nd row. 4 ch., (2 tr. under the 2-ch. space of previous row, 2 ch.) 4 times, 2 tr. under the 4 ch. at beginning of previous row, 2 ch., 1 tr. into same place.
3rd row. 4 ch., (2 tr. under the 2-ch. space of previous row, 2 ch.) 5 times, 2 tr. under the 4 ch. at beginning of previous row, 2 ch., 1 tr. into same place.
Continue in the 3rd row pattern, working the stitches in brackets 1 extra time on every row until the shawl is the size you want it to be. Fasten off.
Mine worked out at about 40 rows, the book says 73 rows, which is probably due to the finer yarn. Anyway, the nice thing about this pattern is that you're starting from the bottom point and working outwards and upwards, symmetrically, until the shawl part is complete.
For the fringe, take 4 strands 50 cm long for each knot and make a knot into each loop down the shaped sides of the shawl. (See large photo of my shawl if you're not quite sure what I mean.)
Work in any stray ends from joining new balls of yarn and you're done!
Because it's a simple treble pattern, it grows really fast and I did it in a few evenings over a week.