Limit your skin cleansing regimen to as little exposure to hot water as possible. Hot water softens up the natural oils on your skin to wash them away, but it also leaches out moisture from your skin. If your skin is extremely sensitive or dry, take your showers and baths as cool as you can stand it, and limit yourself to only five or 10 minutes in the water. Be sparing with soap, too. There's usually no reason to wash everywhere and expose your entire body to chemicals that will dry it out or irritate it. On an average day, washing just your genitals, armpits and feet is usually fine.
After your shower, pat yourself dry. Every moment, you're losing moisture as water evaporates off your skin, but rubbing will only make skin irritation worse.