I'm going to a somewhat fancy party in a few weeks and I'm wondering if you all have input as to what kind of tie I should wear. It's not a black tie event - normally I would wear a tuxedo, but it's my girlfriend's parent's party and her dad isn't wearing a tux and I don't want to seem like I'm showing people up, etc. But it is "jacket and tie required". I'm planning to wear a dark navy suit (cotton because it'll be in June and I roast even in summer-weight wool [an oxymoron as far as I'm concerned]) with a white, spread collar, french cuff shirt. I'm a fan of striped ties, but that kind of seems too "business-y" for an evening party. Anyone have suggestions? Is there a conventional wisdom approach to this situation?