A1. By @ImTheGroom :
I would ring the hostess and ask what she reckons the other blokes will be wearing. Formal means different things to different people, so best to check in. It will be appreciated that you cared enough to ask.
A2. By @archibaldleach :
This X 1,000. Asking the bride or groom is always a good plan when you are in doubt.
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