The pattern is the basic shapes, and around a 1/4 inch allowance maybe? I usually end up bringing my stitching closer to the edge than that in the end, but it works out. I got a rough idea of what the pattern was from the original designer (Eyes5), and once I drew/cut the basic shapes, I just tweeked it between pikmin (adding length here, cutting off some there, etc) until I got the current version.
Hope that answers your questions.
