I like the mismatched color idea but in complementing colors like in the photo. I think the patterns would be too much - especially with guests because they could also be wearing patterns and it might be difficult to keep the party separate from those people - if that makes sense. I feel like in my head you’re usually able to tell the wedding party apart from everyone else. But I’ve also never been a part of a large adult wedding - so don’t take my advice as solid word 😉