I need suggestions

So...I am now responsible for helping my boyfriend make a toga and tunic for a summer camp he is going to be an RA at. I'm having trouble finding appropriate fabric that's cheap for this endeavor. I'm looking for white fabric that's at least 72" wide, but more preferable at least 102" wide (allowing me to fit more than one piece widthwise on the fabric). I will need at least 6 yards of it, and this is a camp costume, so we're hoping to find something that doesn't cost too much.

This is the best I can find: http://www.fabric.com/quilting-fabric-quilt-backing-broadcloth-muslin-fabric-108-bleached-muslin-white.aspx It's not too expensive, but I'm worried it will be too see-through.

Does anyone have any other suggestions? It doesn't have to be muslin, or even cotton, but it does have to be solid white.

Thanks!