You know of course that you cannot scratch your eczema, but sometimes it is hard to resist. When this happens, try prevention methods that will ease up your temptation to scratch, such as taking a nice bath, taking prescribed medication, and cold compresses. This will help ensure that you don't irritate your skin further, causing more excessive itching and possibly an infection.
If you must wear wool, such as in a cold climate, wear cotton underneath it. So invest in a set of lightweight cotton undergarments that can be used when wearing wool or any other potentially irritating fabrics. Polyester can also be an irritant because it can trap moisture in it which can lead to a flare-up.