Oh Gail ... I am Helena, Queen of the Self-Second-Guessers So I feel your pain, truly.
Don't panic - the dress is very pretty, the color combo sounds terrific, the nude shoes will add an expensive vibe. If the fabric looks ok, then don't worry too much about the quality - it only needs to last the night!! The color is gorgeous for a Florida wedding and if it's flattering on you then you are sure to glow.
My experience at weddings it that there is always somewhat of a mix of styles and levels of dress, regardless of how high end or simple, and therefore, no particular thing is likely to stand out. So trust yourself and enjoy!!