I wonder, for those of us who don't have cedar furniture at their disposal, whether a bottle of cedar wood essential oil mixed with a carrier oil and sprayed sparingly onto hanging clothing might be effective?
Handbook of pest control, pg. 222
Billings (1934), and other workers showed that paradichlorobenzene, naphthalene, and the cedar oils do not repel the moths from laying eggs, nor the larvae from feeding on articles in the presence of these materials. Billings concluded that these materials have no repellent action, but they do have a slight fumigation value. Since the worth of these materials rests on the fumigation effect when in heavy concentrations, it is essential that these insecticides be enclosed in containers that are almost airtight. Trunks, satchels, chests, etc., when sealed from the outside are effective when used with these fumigants. Such containers which retain high concentrations of the gases emanating from these fumigants, may keep the larvae from feeding, and death may finally result through starvation.