You will need:
Less than 1/8 yard fabric (my shirt was white and I choose a print fabric that shows through so I also used two 6"x2" strips of white ribbon to fix that problem)
Long Sleeved Shirt (with no cuffs)
Rotary Mat & Cutter or Scissors
I will use my measurements for this tutorial but you can adjust to your liking. I used ¼” seam allowance unless otherwise stated.
Cut out eight 2x6 rectangles from your fabric. I only cut out six rectangles from my fabric and then used two more rectangles that were all white (my ribbon) to make eight.
Take two rectangles and sew them right sides together along 3 edges leaving one long edge un-sewn. Repeat with remaining rectangles. If you have 2 rectangles of a different color like I did, sew each of them to one rectangle of printed fabric, right sides together.
Now you have four STRIPS. Phew, now I can stop saying “rectangle”! Turn all 4 strips right side out and press. Set aside.
Press the ends of your shirt sleeves to make cutting easier. Mark shirt cuffs with “Left” and “Right” as if you are wearing the shirt (with your right arm being the right sleeve and so on). Cut off 5” from each sleeve to make your cuffs.
Turn each cuff inside out and carefully rip the side seams open with your seam ripper.
Open up strip on the right side and fold over all the way to the opposite side of the cuff. Press with the seam facing out to the side, not up like the the fabric will want to do. Top-stitch strip 1/8” from edge directly onto your cuff all the way around the strip then sew buttonholes to each of these strips. Refer to your machine’s user manual if you need help doing the buttonholes.
Open up remaining strip and press so that the unfinished edges on the inside of seam are directly under the strip. Top-stitch on the right side of the strip 1/8” from edge. Make sure to catch the bulky overlap (the unfinished edges that you just pressed under) as you sew. Go all the way around the strip, but make sure you don’t sew it onto your cuff like you did with the first strip.
Bring your two strips together right sides out with the buttonhole strip on top and mark the other strip where you need to sew your buttons. Hand or machine-sew buttons to each blank strip and button up each of your cuffs.
Now check for your mark of “Left” or “Right”, turn your cuff inside out and put it around your sleeve (sleeve should be right side out) with all unfinished edges together. VERY IMPORTANT: When lining them up, make sure the right (as in *wrong and right*) side of your cuff’s opening slit is 180 degrees from your sleeve’s side seam and pin.Sew the cuff to the sleeve along the unfinished edges (use as small of a seam allowance as possible - ¼” at most as to avoid shortening your sleeves any more than you need to.
Repeat instructions for right cuff except start out opening up strip on the left side. It should be a mirror image of your right cuff.