All woolens, ESPECIALLY SURPLUS should be professionaly drycleaned before storage. The commercial cleaners will apply mothproofing in the cleaning process. After cleaning any number of the storage methods are usefull. The main criteria is a tightly controlled environment non condusive to moths and other harmfull insects. A good housecleaning ( especially in older wooden framed buildings) followed by a general insect fogger before storing in your prefered container or closet is a beginning programme. You can then use a low wattage light in a closet , the nominaly usefull (but aesthetically pleasing) cedar and even a open container of pungeant pipe tobacco to discourage mature moths.