Old Navy Maternity Full Panel Skinny Jeans Size 12 Dark Wash Denim. These maternity jeans from Old Navy come in a skinny cut in a dark wash. They have the over the belly full panel of elastic to keep your pants up and belly supported. These do have functional front and back pockets. They are 84% cotton, 14% polyester, and 2% spandex. Measurements are shown in the photos.