I think you picked too safe and too wild. Try to go middle of the road with a dress.
You don't want to look like you are trying too hard. And the comments for the day should be "Wow check out his Wife"
Not That's his Mom?
Let the bride shine. I wouldn't want anyone to comment on me at all at my sons wedding. It's not about me.
Oh dear lord, I love my FDIL so much, I'm totally convinced now that the "wild" dress would draw too much attention to me. It won't happen, I promise.
OP,you sound like a terrific person-gracious,and classy,and BRAVE for putting this out there! Sounds like you're coming to the difficult realization that time is marching on,and the time for center stage is not your son's wedding day.
Yes, it's true. On top of the emotion that my firstborn is getting married, I'm dealing with the fact that I'm not a spring chicken anymore. It's hard!
In a couple of months, when it's too late to return the Fabergé Egg dress, bring it out and tell your DIL you bought it to change into for the reception.
Faberge' Egg dress??

I was getting choked up reading this thread, but this made me laugh!
I am also wondering why you feel the need for two dresses for your son's wedding? I've never heard of the mother-of-the-groom changing dresses between the wedding and reception.
I really liked that wild dress, it looks like a FUN dress, but there's no way I'd wear it to church for the ceremony. Also, I have this image of myself being the classy, elegant mom during the ceremony. That's why I thought of changing dresses.
What about something like this?
This is awesome!!!
I was thinking, I think I'm putting way so much thought in my own appearance because, well, the getting olde thing, but also because there's nothing else for me to do for the wedding but wait for it to happen. Everything has already been arranged (bridal gown, bridesmaids dresses, reception venue, food, music, flowers, etc). My FDIL invited me to go with her and her mother to her fitting, so I'm, definitely looking forward to that, it was very thoughtful of her. I don't feel left out, just so excited that I wish I had something to do. Time to find a hobby, I think.
I've learned a lot with this thread. The reason i didn't get defensive and was because I really want to do the right thing. In my mind, I thought it could be both "wow look at the beautiful bride" as well as 'wow is that your mom?" And now I know their wedding is not the place to fish for compliments for myself. Maybe I'll get DH to take me to vegas with that Faberge' Egg gown, since he told me this morning I'd look like a vegas showgirl in it.

Elegant, classy, not drawing attention to myself. Lesson learned. Wow. Thanks so much. As much as I wish you guys said GO FOR IT, you probably saved my from making an *** out of myself and for hurting some feelings at the wedding. Damn it's tough to be a bug!