NOTE: You get the pattern in both Norwegian and English by downloading it here on Ravelry!
This pattern includes:
Pictures and explanation on Latvian braid
Explanation and figures on invisible stitches
You need 150 - 200 grams of main color,
and you could use remnants for the accent color,
about 30 grams.
Cascade 220 wool comes in 100 grams skeins.