It’s a shawl worked from one point to the other one, at first with increases and short rows (the triangles with the contrasting color), then with decreases (the ribbed part).

YARN: Loft, Brooklyn Tweed, 100% American Wool, 50 grams, 275 yards,

3 skeins in 3 contrasting colors (MC: main color in the pictures the purple one, CC1: contrasting color 1, the medium purple, CC2: contrasting color 2, light purple)

Notions: 1 stitch markers, tapestry needle to weave in ends
Needles: 4 mm circular needles

GAUGE: 18 sts x 28 rows in 10x 10 cm