During the first 30 days of mourning for a loved one, one may not wear freshly laundered clothing. The same holds true for the Nine Days when we all mourn the destruction of the Batei Mikdash. The definition of freshly laundered clothing is clothing that has not been worn since it has been laundered. This does not mean that one must wear dirty clothing. Rather, once clothing has been worn for a half hour [prior to the Nine Days] it can be worn during the Nine Days. The prohibition of wearing freshly laundered clothing is limited to outer garments as opposed to undergarments and pajamas.