Decide on a budget for the project; this will help you determine the grade of leather you can purchase. Plan to spend between $5 and $10 per square foot for upholstery-grade leather (2010 prices).
Determine whether the upholstery leather is top grain or split. A split hide has been peeled into layers; the top grain is the outermost surface, while a split is an inner layer.
Use the more durable top grain for cushions and backrests and splits for backs and sides (if you are trying to save money).
Decide between aniline leather or coated, pigmented leather. Full aniline leather is dyed through, with no top finish, and is the most flexible and luxuriant (and expensive); leather in the $10 per square foot range is likely aniline or semi-aniline finish. Pigmented leather is painted and is far more commonly used in leather upholstery because of its lower cost (starting at $5 per square foot) and even finish.