Championship Ashe need help with lighting

[biggeorge]

Hi, my friend is making championship Ashe cosplay and I'm helping her with some technical stuff and 3d printing. I've run into problem with the floating cape. We would like to make it glow like in the picture, but I can't figure out how to do it. I've tried some side glow optic fibers but they are not visible through cloth. I'm frustrated because I want to make it work, because it would be so cool. I would appreciate some advice.
Thank you

 

[JohnnyMarvel]

What is the cape made from? Is it a thin gossamer fabric? Translucent? Glossy? That shimmering plastic insect wings material?
The thickness and type of material you are trying to make glow will make a huge difference.
If you're stuck with a thick cotton material you may need to fake the glow effect by a great paintjob that replicates the glowing effect.