Not sacrilegious in my opinion... it's your dress, you should be able to do with it what you want. I'm a little on the sentimental side, so I don't think I'd be able to do it. But if you're okay with it, no one should tell you otherwise.
I vote for the ghost bride too! That's much more fun and eerie. I'm also thinking of the ghost bride at the Haunted Mansion with the beating heart, etc! It's going to be fun to see what you do with it.
