Skirts
You've got a few options. Wildwasser in Boulder makes a women's skirt called the Mini skirt, it's blue, a bit easier to put onto the boats, and has a shorter tunnel. Mountain Surf also makes a women's skirt (also has a shorter tunnel). We carry the Mini Skirt and can order the Mountain Surf skirts.
If your looking for the cheapest way, try Stitch Lines on south Broadway. They can do just about anything with sport fabrics.