Here is the original sweater:
thrifting extravaganza last week.
The first step is to cut the sleeves. Make sure to give yourself more length than you will probably need to allow room for mistakes. I used the trimmed end of the sleeves (the end that is closest to your shoulder when you wear a sweater) for my hands.
While your sleeve is still inside out, flip the fabric of the fingers and thumb over and hem them. After several practice runs on leftover fabric from this sweater, I came to the conclusion that hemming it straight across with a sewing machine was impossible without stretching the fabric out and losing the shape, so I ended up hemming the sleeves by hand.
...And now I love them!
One note - the sweater I used was made from 60% cotton and 40% acrylic. I've come to the conclusion that this is not the easiest fabric combination to use. It was so stretchy, I struggled to keep their shape intact while sewing. I would recommend using a different combination of fabric because of this. :)