Shop petite-average cap size wigs. For head sizes in between the average to smaller perimeter dimension. Women's, teens and kid's wig styles when the either or simply doesn't work. The sizing of wig cap circumference of the petite-average is approximately 21 to maximum 22 inches. Never miss out a what might be a perfect style in a smaller head size, we carry a look for everyone. Need to be sure, use a seamstress soft measuring tape to get your true head size, measuring around your head following your natural hairline, and from ear to ear and front to back.