Use cheap stuff only to make practice models. I firmly believe in using the highest quality fabrics for the finished product. You put enough hours, sweat, tears, and even (if you stick your finger with the needle, which I occasionally do) blood into making the finished product that it seems stupid to make it of cheap fabrics that won't last!
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey