The least expensive way to put away emergency clothing if sewing is an option is to purchase table linnens, draperies/curtains, bedspreads and very large sized clothing at the thrift stores. They generally have a surplus of these at extreamly low prices. A couple of size 42 fancy dresses make great lingerie, dressy shirts and outfits. My favorite patterns are the old clothes I wore until someone told me to quit, I now add an inch or two here and there to some of them. A diluted coat of weldbond glue and plastic wrap backing would make them extra durable. There are ususally great sewing instruction books at the used book stores as well.
Do not forget the buttons, buy 10 cent grarage sale items with buttons, zippers and other notions. These little things can be pricey if purchased new. And I do not ever relegate an item to the rag pile without removing these items first if they are in reasonably good condition.
For durability and reduced work load, replacing collars and cuffs on quality shirts and blouses can be a great labour saver.
My husband is currently learning to sew on the occasional button rather than declaring a need for a new shirt, pants. New shoe laces can save the day as well.