"The Complete Photo Guide to Slipcovers, Pillows, and Bedding" by Karen Erickson. The book is available on Amazon here. I contributed a chapter on making an Office task chair slipcover which starts on page 29. The book as the title explains is full of pictures detailing each step.
Here are the after pictures of the slipcover I finished for the book.
I want to link you to my friend Linda's slipcover blog Pencil me in. Her niece, Kari Senter, is a student at NC State majoring in Fashion and Textile Design and was interning with her Aunt this week and chose to make an office chair slipcover using the instructions from the above mentioned book. She did an awesome job being that this is her first attempt at making a slipcover. You can check out her finished slipcover over at the Pencil me in blog.