I piped the straps and upper bodice, and understitched the facing, to manage the bouncy fabric, and am pleased with the neat edge. It required leaving a gap in the piping of the bodice and facing for later strap insertion, and then basting these in place and attaching these sections of piping through 3 layers of fabric - very fiddly, but worth it for the effect.
clean finish method demonstrated by SunnyGal. The facings were then hand stitched to the lining.
The main part of the dress is matt side out, but I used the shiny side out for the waist piece and the piping for a subtle contrast.
My daughter admired the dress suitably, allowed pre dinner photos and even sent me a photo of the dress in action on SouthBank.
Stashbusting statistics 2.5m silk satin 2012 and a bit of cotton batiste