Next Saturday (not tomorrow) is Tim's nephew's wedding. It's at a really pretty venue that's part of the "barn wedding" trend. But, you know, a fancy, beautifully decorated, non-livestock barn that's only used for events.
Nephew and fiance are super casual people, as are all of their friends. I expect the female guests might wear maxi dresses or something, but I wouldn't be surprised to see shorts on the guys. And that's all fine! But nephew's dad keeps asking nephew what he should wear -- after all, this is his son's wedding -- and all nephew says is "If you wear a suit, you'll be overdressed," but doesn't offer any other advice.
I told nephew's dad to wear his suit but maybe leave the jacket off, and if the guests are super casual, maybe take off his tie. I feel like the parents of the bride and groom can be more formal than the guests if they want. Or not! It would really help if nephew gave a little guidance, but that's not going to happen. (Their invitation didn't have anything about the dress code; they just know their people and know they'll be dressed casually.)
I'm officiating the wedding, and I'm wearing my default floral dress, which I would have worn if I were just a guest. If that's dressier than most of the guests there, well, (1) I'm the officiant, (2) I'm his 47-year-old aunt (and therefore twice as old as most of their friends who will be there, which makes me An Old), and (3) it doesn't really bother me to be in a dress when other people are more casual.
The bride is wearing a traditional white wedding gown, with cowboy boots. Her bridesmaids are wearing traditional bridesmaid dresses and flats. I think the groom is wearing dress pants, dress shirt, a vest, and bow tie (and possibly his clompy work boots). And I think the groomsmen are wearing dress pants, dress shirt, suspenders, and bow ties. So the wedding party isn't as formal as some weddings, but they aren't in shorts and sundresses, either.