Re: Jeans to a wedding
If the wedding I’m being invited to is in someone’s backyard and if the family is non-desi, then I MAY consider wearing nice jeans with a nice top/jewelry. But even then I’ll probably wear a dress. I simply cannot wrap my mind around wearing jeans to a wedding/reception that’s being held at a hotel. Unless its at a place like Motel 6. 
At my wedding, literally half the guests were non-desi. Venue was a nice hotel in downtown. Our invitation wording was formal but did not say anything about attire. Yet every-single-man who came to the wedding wore a suit, and every woman wore either a cocktail dress or desi outfit. Heck even the 3 kids (under 5) that were brought were dressed in nice/formal clothing! Even among the vendors…the only one wearing jeans & polo-shirt was my photographer/videographers.
In this case, I’d judge the parents. I assume the parents (especially the mom) were not in jeans too.