You've asked a question that can't be answered properly without more information. Usually the inner border is thinner than the outer border, but the width of both depends on many things, including the size of the top. For a bed quilt, a 7" outer border might be just fine, but for a wall hanging it would probably be disproportional. The number and width of the borders might also depend on the design of the top, and it often depends on how big we want the quilt to be. If you could show a picture it would help.