Even though I already had a skirt that might work, I ended up making a new skirt instead of using the one I already had. Mostly because I didn't particularly feel like cutting the old on up for the front split, but also because I kind of wanted a lighter more yellow colour. I lined it using the leftovers I still had of the old fabric, though, and with the split (which conveniently has "waves" created by the seam), it gives a delightful "fiery" look! Unfortunately, I don't have any good pictures of the skirt, but here are some of the other extras:
I also found a pair of pumps that just screamed Fire Elsa!Facing the eternal problem of certain cosplays; "how do I carry all my stuff?" I solved it by making a cute, little bag from the left over materials. This was a life saver, and I like it so much I might actually use it for other occasions as well!