First, you need three fabrics. The largest piece needs to be 7/8 of a yard, the accent strip is 1/8 of a yard, and the cuff is 1/3 of a yard. (This makes a pretty big pillow).
First, take the accent piece and fold it in half and iron it.
Open up the cuff so you can see the accent piece and all the fabrics are facing right side up.
Flip the pillow inside out, now sew along the three sides again, the outside raw seams are now getting 'tucked' and sewed inside this new inner seam on the inside.