Wedding Attire for attendee?

[DotDLL]

Thanks for the replies from everyone!

To answer people's questions about timing, the wedding is to start at 6 PM, and will be at a time of year when that should provide about two hours of additional daylight.

My current inclination is to go with something that's a bit more formal than just 'daywear', and to use the following, at least (which I own, and which still fit!):
- black Argyle jacket and vest
- gray-fur, silver-cantle sporran
- black, ghillie shoes

All of the above is subject to change, though.

I'd consider wearing a Prince Charlie, however I do not own one, yet. I'm sure that while that level of formality would be welcomed, I'm imagining that it's not strictly necessary. I'd be surprised to see too many people, if any, in tuxes, perhaps outside of members of the wedding party.

Regarding the exact definition of "cocktail attire", I'll ask the couple the next time I see them, which will probably be within the next week or two. I have some guesses at what this is, based on knowing the couple and seeing what they've worn when going out for cocktails (in/around Boston), but asking does seem prudent.