Hi I'm about to start doing a couple vest for some family members using the Tandly leather vest pattern, my question is on the instruction it says "Be sure to allow at least 1/4"-1/2" extra on all edges to turn the leather for a finished edge..." so my question is does this mean for me to cut a half inch extra all the way around the pattern? or is the 1/4"-1/2" already included in the pattern?