Best fabric to make a bow that will keep it's shape?
Okay, for my Charlotte cosplay I want to make some bows that I can tie into the pigtails of my wig (like in the picture below). Like, make a big long ribbon then tie it onto the pigtails into a bow. I've had some cotton lying around that I've practiced tying around things, but they're flimsy and don't keep their shape. I found a print that I really like but this particular one only comes in a jersey knit and a cotton.
What can I do to make it stiff enough to keep its shape once tied but not so thick or stiff that I can't tie it? Will these fabrics work or will I need to look elsewhere?
Sorry for the silly questions, but I'm not great with fabrics and such.
Conventions for 2015 (so far...): Momocon, A-Kon, Otakuthon, Sac Anime
Cosplay line-up: Mayoi Hachikuji (Bakemonogatari), Nona (Death Parade), Nagisa Momoe (Madoka Magica), Menma (AnoHana), Tsukihi Araragi (Bakemonogatari)