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I am far from an expert. I would recommend that you ask around in your ward and try to find a woman who is or has recently been a temple worker and get advice from her on temple gowns.

Here's a website for temple gowns.
http://www.ldsapparel.com/gowns.html

It seems to me that if your wedding dress is very simple you will be able to use it as a temple gown but if you want any of the more traditional elements like the big poofy skirt or a train then you'd be better off renting (yes that's possible) or buying used and reselling it. Maybe there's an heirloom dress somewhere in your family you could use?

Ya, I don't want the poof or a train. I like simple and pretty. I'll figure something out. I'll look for another seamstress who thinks they can do it.

This was posted semi-recently:
Mormon Wedding Dress Tips

Is there a picture we can see? Or do you want to keep it under wraps until the wedding? smile

It's a good thing that you didn't post it blaugh

You wouldn't want me to see it before the wedding blaugh blaugh

hmm.... maybe I can arrange to see the dress then blaugh she has said that I can't : sweatdrop

gonk