Right at this very moment, as my sister takes her turn hogging the irresistible, shiny, frightening, bright-white machine, I type this message, as my fingers are hugged with indescribable warmth--you'll have to feel it yourself to believe it.
Materials: fleece/jersey sweatshirt material (I'm using a fleece lined sweatshirt jersey), sewing machine, thread, scissors, measuring tape
Measure around your hand (right above your thumb, around your four fingers and the knuckles), your forearm, and your upper arm. Cut out 2 trapezoids/rectangles with those dimensions--so start off with your hand measurement, widen it to your forearm measurement, and have the bottom of the rectangle finish with your upper arm measurement.
Fold right sides together lengthwise and sew down about 2." Leave a gap for your thumb about 1.5", and then sew up the rest of your arm warmer. Repeat for 2nd side. You can do a zigzag stitch on the top and bottom to prevent raveling. Done! Voila!
With the rest of the material my sister made a dolman sweatshirt w/o cuffs with my tutorial. She later added a bottom band. Have some more tutorials coming up! :) Fabric was very cheap--about 2.50 for 1 and 1/3 yard!