Where can I find very stretchy lace fabric - in black?

I’m putting together costuming for my dance company and we need lace flowy pants for one section. I can’t find an affordable pair anywhere so I am going to have them made. The problem is now I can’t find stretchy enough lace. I know it exists because we have some left over from years ago. I think I need 15% spandex or more. Any ideas? Here is an example if it helps http://www.lulus.com/products/drums-in-the-wind-black-lace-pants/34361.html