You require two colors of yarn. For example, the yarn for the background (white in the pattern) and blue yarn.
Terminology: all crochet terms used are U.S.
Yarn weight: Fingering. For example, Scheepjes Whirl (ball weight: 215 g, yarn length: 1000 m/1093.61 yds) or Scheepjes Whirlette (ball weight: 100 g, yarn length: 455 m/497.6 yds).

Overlay mosaic with striped WS or Double-sided Overlay Mosaic crochet row by row.

Hook 2.5 mm. Hook size needed to match the gauge.
Gauge: 13 stitches in 5cm (2”) by 7 rows in 5cm (2”) in dc stitch pattern.
Yardage approx.
Overlay mosaic with striped WS: 975 m of blue and 965 m of white (1066 yards of blue, 1055 yards of white)
Double sided overlay mosaic: 1150 m of blue and 1170 m of white (1258 yards of blue, 1280 yards of white)
Size: I did 6 repetitions of the center section, my shawl is 41 cm wide and 150 cm long (119 rows by 389 stitches, 16⅛ inches wide and 59 inches long), fringe length not included.

Double filet crochet, Interlocking filet crochet.

Hook 2.5 – 3 mm. Hook size needed to match the gauge.
Gauge: 6х7 windows in 5х5 cm (2”х2”).
Yardage approx. 1000 m of blue and 1000 m of white (1093.61 yards of blue, 1093.61 yards of white)