How do I choose the right cap size for my head? The sizes will range from Petite, Average, or Large. Here's a simple way to find your head measurement for a wig:Take a flexible measuring tape. Wrap it around your head, starting in the center of your forehead, just above your eyebrows. Bring the tape around your head, just above your ears. Continue to the back of your head, around the nape of your neck (where your hairline ends). Bring the tape back to the starting point on your...