The dress has side slits, so I had a front piece which had embroidery all over it, and a back piece which was plain. I decided to use the plain back piece and I cut across it horizontally; then I had to do some figuring. If I did the expected thing and made a seam across that edge to attach it, some of the embroidered design would be taken into that seam and spoil the look. I placed the piece underneath the bottom edge instead and pinned it. I don't have anything against frayed edges in some situations and I decided this was preferable. So, I just zigzagged it securely and also the hem edge.
The back was a little different, because I used the lower part of that same piece - but it was wider because of the a-line shape. So I cut it up the middle and made a center seam for that piece (sorry, I didn't think to take a photo and I have it on now!) and then did some colorful top stitching on either side for decoration. You see, I wanted to make the piece shorter in width by taking it up in the middle because of the side slits - I didn't have to finish either edge - the sides just matched up with the slits. I don't know how clear I'm being.
Anyway, it's the perfect length and I think this fraying suits the whole jumper. It definitely suits me!