Suzie-- I've actually been trying to tackle that same issue too, haha. I'm thinking that layering varios fabrics, like a yellow-orange tulle or organza gathered over top of a shiny red fabric, might be a cool way to do a streak of flame.
Personally, I'm also gonna go with the EL Wire route to add a little extra warm glow, since I'm already buying a bunch of orange and yellow for another project. Might as well make use of the extra, right? *laughs*
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- Rose Lalonde "Glow" Tier (Homestuck): 95% (Detailing) Otakon 2014
- Fancy Mewtwo Gijinka (Cowslip Gijinka): 3% (Planning) Otakon 2014
- Secret Cosplay (???): 1% (Planning) Katsucon 2015
- Magic Armor Link (LoZ: Twilight Princess): 15% (Patterning) MAGfest 2015