NEW YORK – They've been part of the American "uniform" for years, worn to casual restaurants, house parties, and some workplaces. But as jeans become more expensive, they are also becoming more ubiquitous, showing up everywhere from Midwestern churches to Broadway shows. Nothing is off limits, it seems. Or is it? Among those who buy high-priced, designer denim or who simply don jeans frequently - there's debate about where it's appropriate to wear them. The tug of war over jeans etiquette is particularly prevalent in New York City. Here, people tend to be more creative about their appearance, and are...