Shirt Cuff

                   

The Book says, “ A shirt cuff can be used to finish a sleeve at the wrist…  The cuff-end seams are sewn after one layer of cuff is sewn to the sleeve.”

Prepare your sleeve with a placket (placket lessons here) and any gathering or pleating required 

Prepare your cuff by attaching the the interfacing (interfacing lessons here)
   

And press a crease along the length of the cuff, in the middle

Pin the cuff to the sleeve, right sides together

Sew the cuff to the sleeve on the sleeve side

Press the seam allowance toward the cuff

And press 1/4 inch of the open end toward the wrong side of the cuff

Then fold the cuff in half along the previously pressed crease, right sides together and overlapping the seam line on the right side of the sleeve.
(sorry, forgot to get a picture)

Sew along the ends (where the placket opening is)  and snip corners

Turn cuff right side out.  Use a blunt something, such as a rockin’ flame pencil, to push the corners out

Now pin the cuff in place with the sleeve wrong side out

And stitch in the ditch, along the seamline attaching the cuff to sleeve, securing the cuff in place

That’s it.

So here are the Standard Sleeve Cuff and the Shirt Cuff side by side so you can see the difference.
With the Standard Sleeve Cuff , you make the cuff first, then attach to the sleeve with a topstitch finish. 
The Shirt Cuff, you attach one side of the cuff to the sleeve, then finish making the cuff.  The stitching is in the “ditch” so you can’t really see it.