A too-long pair of pajama bottoms is frustrating and unflattering. Rather than trying to make do with them as they are, you can easily remedy the problem by hemming them yourself. Even if you haven't done a lot of sewing, hemming a pair of pajama bottoms is relatively fast and simple. With a few basic sewing items you can easily alter a pair of pajama bottoms in about 30 to 40 minutes

Try on the pajama bottoms. Place pins in the fabric horizontally where you want the new hem to lie. Do this on both of the pajama bottom pant legs.

Lay out the pajama bottoms on a table. Make the legs are lined up hem-to-hem. Do not remove the pins just yet. Use a ruler to measure up from the old hem to a horizontally-placed pin. This is the measurement you'll be using around each pajama bottom leg.

Measuring up from the hem every 2 to 3 inches using the previous measurement and draw short marking lines around each pajama bottom pant leg. Make short marking lines with a chalk marking tool. Carefully remove all of the pins.

Draw another chalk line on each leg, 1 1/2 inches down from the previously drawn chalk lines. These are to be your new hem-line, where you will cut the fabric off. Try on the pajama bottoms again to double-check the length. Make sure you're satisfied with the new hem before proceeding.

Finish the raw edges of the hem line of your pajama bottoms. If you have the use of a serger, this is a good way to keep the raw edges from raveling. If you don't have the use of a serger, use a common zigzag stitch to finish the raw edges.

Cut off the excess fabric of your pajama bottoms. Fold up your new hem-line 1 1/2 inches, making the pajama bottoms your desired length, pin it in place. Place the pins vertically in the fabric. Gently iron the hem in place.

Baste the hem in place. Use a needle and thread or the basting stitch on your sewing machine. If you're using a sewing machine, remove the pins when sewing and make sure you do not sew over any of the pins.

Iron the hem again, then sew the hem permanently in place. Use a straight stitch or a twin needle function if your sewing machine has that capability. Once both hems are sewn permanently in place, give them both a final ironing.