What to wear?

Here comes the moment of truth. I have a wedding to attend next month, and even though tons of ideas pop to my mind about what to wear, the truth is: I've got to keep it real.

At least I know excatly what I want:
I have to choose something adequate for my body type and size , but
I have to look really nice and sexy. I hate looking OLDER THAN I AM.

I also, and this is really important, need to stay on budget. So that amazing purple Oscar de la Renta has to stay only in my dreams.

What will come out out of this?
Who knows, but I promise I will let you know...

Write back with any ideas!