Hemming sleeves is a sewing technique used to shorten the length of a sleeve. It involves folding up the excess fabric at the bottom of the sleeve and stitching it in place. Hemming sleeves can be done by hand or by machine, and there are a variety of different stitches that can be used.
There are many reasons why you might need to hem sleeves. For example, you may have bought a shirt or blouse that has sleeves that are too long, or you may have shrunk a garment in the wash and need to shorten the sleeves to fit. Hemming sleeves can also be a way to add a personal touch to a garment, by creating a unique and custom look.