Before packing up, clean everything. Dirty clothes are more attractive to moths and if you get one hole in a sweater, it's done for. Follow instructions on all your labels for the best method. But, if it's knit cashmere, the Loro Piana guy at Bergdorfs told me to hand wash it in cold water and let it air dry. Do not twist or bunch the fabric during this process as it could damage the garment, and be sure to remove any pills beforehand.