Heavy old Curtains from the 1950s or 60s are perfect for bags, dresses, jackets or coats. You can also turn them into medieval- or renaissance-robes. And you can buy them for a cheap price on flea-markets, in second-hand-stores or social departements.
This jacket I sewed from a short, shiny-red curtain. The neckline ist trimmed with satin-ribbon and from all remaining scraps I made a front-bag and some origami-embellishment. Almost zero-waste!