I have a bit different idea, that might add a different feel to it. Do that bodice and front panel in the satin, and do the ruffles in a more sheer chiffon, a very fine tulle, or something along those lines. It'll make for a lighter final product, mitigate the fraying issue (depending on what kind you get), and adds an airy kind of feel that kind of works in an Angelic Euphemia kind of way (she is in Lelouch's mind anyway).
And mixing fabric like that is really in with wedding dresses right now anyway |D
Current projects - ACen 2012
God Tier Jade - Need better hood, tights - otherwise 90%
Jack Noir - 20%
(Possible) Ika Musume - Squid Girl - 0%