After too many years of snooty dress codes, most clubs, even the chichi hot spots, have loosened up and opened their hallowed doors to patrons wearing jeans. Good old denim, the fabric that changed America, conquers another frontier. It used to be that admittance to a high-end joint began with expensive slacks for men and short skirts for women, but these nights it's all about looking cool, not elegant, so "proper attire required" is an instruction better left to galas. Not that regal clothes are evil. Linen pants are classy, but denim is classic, and a pair of well-worn Levis with a white button-down shirt and leather boots is as dressed up as anybody needs be to consume alcohol, endure pounding music, and maybe get laid. Besides, jeans look better with another nightlife fashion trend: pink shirts. Further, it should be noted that nothing clashes with earplugs.