To wear this Nelly Halter Dress, simply put it on over your head and adjust the halter straps to fit comfortably around your neck. As for the mark on the left waist, it's quite small and won't take away from the overall look. When you're done wearing it, hand - wash it gently in cold water with mild detergent. Avoid scrubbing the marked area too hard. Hang it to dry and it'll be ready for your next wear. Since it's a sample, treat it with extra care to keep it looking great for a long time.