It should attach at the waistline, be the width of your shoulder blades, and hang down far enough to just cover the rear. A good generic measurement would be 14" wide by about 10" long.
Hope this helps.
There is no specification in the Lancer standards regarding faux vs. real suede. Either would be acceptable. Its the appearance and not the material that is the issue.
Feel free to use the faux if you like.