You'll need a decent sewing machine, scissors or rotary cutter, elastic thread, regular needle, thread & buttons! If you were to buy the boot toppers or arm warmers in the store, they sell for $10-20 each - ridiculous!
Step 1: De-Construct the Sweater
Since my sweater was a bit small on me to begin with, I could not use the arms which I cut off for the leg warmers (too tight). So, I used the back part of the sweater to cut out my pieces for my boot toppers. I will explain that in the next step & the measurement options.
I ended up being able to make two sets of arm warmers with the material - as I used the front part of the sweater with the pockets for one set, as well as having the arms which I cut off. You can make quite a lot of things from one sweater!