You will need:
-1 yard of jersey knit fabric
-a sewing machine
To begin with, you will need to purchase your fabric. I only ended up needing one yard of jersey knit for my scarf, as the fabric came 60inches wide. I think that is pretty standard for this fabric, but just incase you luvvies run into problems, the total dimensions of my fabric were 36in x 60in.
Once you get your fabric home, lay it out flat and fold it in half long-ways or "hot dog style," to take you back to elementary school. You will then sew the two edges of your fabric together. I didn't even pin my fabric before I started sewing because it honestly doesn't matter if your seam is perfectly straight or not. Also, jersey doesn't unravel, so you don't even have to worry about the fact that your edges are unfinished. Once you have done this, your fabric should basically resemble a long tube.
Next, turn your tube inside out. Now your unfinished seam should be on the inside of your scarf.
In order to make your scarf into a circle, the final step is to sew the two remaining loose ends together. Again, don't worry about the seam, as it will be against your neck and totally unseen when you wear the scarf. 
Ta-da! That's all there is to it! Bonus: for all you new mom's out there, it doubles as a fantastic nursing cover!
