my wife has quite a bit more taste than me in clothing. That said, she said that would likely be a good pick.
If you want to be on the safe side, just ask the bride or groom what the wedding party is wearing. The only real odds that you'd stick out like a sore thumb is if they do some sort of t-shirt and sun dress deal. Odds are that won't be the case. But a question to them will cover it, methinks.
