I'm currently working on a costume that has a long white apron on top. I have simple wihte cotton for this part, and I was wondering if I should double the fabric, or just hem the edges. I was worrried that if I did just one layer, the navy dress I have beneath it would show through, and make things look too messy. Would anyone have suggestions on what I should do? I want to make the costume look as good as it can, so I'm willing to put extra effort into it.