Go nautical, go preppy, go patriotic with your undies when you make them with Robert Kaufman's Harbor Stripe Jersey. The knits in this category are 95% cotton with 5% spandex for stretch and are great for everyday underwear and camisoles. The fabric is 57-58â inches wide and weighs 6.78 oz per square yard. CARE INSTRUCTIONS Machine or hand wash in cold water with similar colors with a mild detergent, do not use bleach. Dry flat, cool iron when needed. This fabric is not suitable for use in sleepwear for children 12 years or younger.