Here is a neat tutorial from Rebekah at Verdant Bents, showing how she transformed an old wedding dress from a thrift shop into a maxi skirt. This is a great idea and could be used for anything from everyday skirts to formal or church clothing. You could even make a skirt for a wedding ensemble. (Yes, some ladies wear skirts for their weddings. I am one of them.) :-) You also could use this on a dress you own that you no longer wear but you still would like it as a skirt.
Tutorial: Turn an old dress to a maxi skirt