What fabric is appropriate for an ironing board cover?
You can buy "heat-resistant fabric" by the yard at large fabric stores in the utility fabrics section (literally called "ironing board fabric" at a popular chain) or online (several sources came up on a search), for about the same price as cotton duck or canvas, often for less. Measure the board and be sure to allow fabric to tuck under and attach to the bottom in the same way as the original cover. It is strong but not bulky or very stiff, silver-gray, and easy to work with, also often used for potholders. If needed, you should replace the cotton padding while you are at it, with cotton batting, from the same sources.