Yarn Estimator:
This assumes you are using around size 5 needles for a 60 stitches-wide season 12 scarf. (as seen in "Robot") The default values you see below are for the yarn I recommended above but you can enter the yardage for whatever yarn you are buying. I have allowed for the extra yarn needed for tassels so this should be plenty, but it is still just a general guide!
Blue Sky Alpaca
This yarn comes in great colors and it is Alpaca, which is very soft and luxurious. It costs about $8-9 per skein and seems to be widely available. You should use these colors:
Red - #518 ("Sport Weight Solids" range)
Beige - #503 ("Sport Weight Solids" range)
Brown - #502 ("Sport Weight Solids" range) -Use this for both brown and khaki
Colors: (in sport weight)
308 "Sunburst Gold" (Yellow) about 2 skeins
N94 "Bev's Bear" (Brown) about 2 skeins
880 "Charcoal" (Gray) about 2 skeins
720 "Ash" (Tan) about 3 skeins
N46 "Red Fox " (Red) about 2 skeins
N18 "Plum Line " (Purple) about 2 skeins
522 "Nervous Green" (Green) about 3 skeins