Having seen a few brides wear the silver Falconetti dress, it's safe to say that you'd need to opt for a different colour. But that said, A friend was recently at a society wedding in the UK, and two of the guests wore the silver. No-one batted an eyelid. And, fwiw, I have worn the silver to a US wedding. They're less precious about guests wearing white/silver.
Anyway, it's a great dress. Lots of versions in other colours and floral prints to choose from, so you'll easily find something.