You can buy some cotton fabric that is patterned to look like fire, but I presume you're going to make it look like you're bending it, so that might not be the best choice.
Most likely, you'll want to bunch up red and orange sheers. Tulle will probably be a good choice, since it gives a lot of volume, but mixing some organza in could potentially work as well.
DeviantART // Tumblr // Facebook
- Mermaid Ariel- Swimmable (Disney's The Little Mermaid): 23% (Patterning!) Colossalcon 2015
- Magic Armor Link 2.0 (LoZ: Twilight Princess): 50% (Armor Revamp) Summer 2015
- Genderbend Makoto (Free! Eternal Summer): 27% (Wig Styling) Colossalcon 2015
- Emperor Lelouch (Code Geass): 2% (Planning) Summer 2015