I would recommend not going with as much ease as the pattern states unless you tend to be a tight knitter.

the pattern is here.

MC's Alegria Grande 

• Fiber Content
  75% superwash merino, 25% polyamide
• Yardage
  Alegria Grande: approx. 197 yds / 180 mts per 3.5 oz / 100g
  

CCs
Spincycle Yarns
Dream State (100% American Wool)
150 yards 137 meters 50 grams

please note for size 3, i am only including 1 skein each of CC2 and CC3- i am assuming you will be on gauge and that the designer incorporated a 10% yardage overage, so you will get 4 skeins of the MC Alegria Grande, and then 2 skeins Spin Cycle dream state in C1 but just one skein of the other two colors.  

For sizes 4-6 you will get 5 skeins of the Alegira Grande, and 2 each of your CC's.