New clothes for fall are a rite of passage. And when you’re old enough to pick your own, what do you go for? Jeans. We assembled a couple dozen tweens to choose their favorite denims. Jackson, 12, went immediately to these skinny Cheap Mondays ($65 at Urban Outfitters, 162 Second Ave., nr. 10th St.; 212-375-1277). “I like that it looks almost like it’s a digital pattern,” he said. “And they’re comfortable. It’s not like you have to wear them in for months.” Which is good, when you’re a bouncing-off-the-walls kid. For more from the 10-to-14 set, click here. And while you might already have this year’s binder, go here for school supplies by way of Japan.