I have been known to use old bed sheets for frost and shade protection in my garden. But sheets have some disadvantages: they block too much light, can be unsightly, can block the rain, and must be removed during the daytime in the winter. I have also used plastic, which definitely blocks the rain and can create an environment that is too hot and humid during the daytime. Even though I like to recycle and use items that I already have availalble on my farm, garden fabrics that are made specifically for use in the garden can be a great investment, protecting the garden with non of the downsides. Several types of garden fabric are available on the commercial market. Some are made specifically to provide shade; others protect from frost. There are also dual-purpose fabrics. The following links provide information about garden fabric types and uses, as well as the USDA high tunnel program:
Using Garden Fabric by Gardener’s Supply Company
Use Row Covers to Extend Your Season by Rodale’s Organic Life
Hoop House to Hotel video by USDA NRCS Nevada
Make a Row Cover Hoop House by Bonnie Plants