Forgive the pom-pom shaking. It’s just that we’ve been gearing up for fall, and these NYC designers do not disappoint. Take local label Keller, which deserves a song and dance for boy-meets-girl looks that mix sophisticated and sloppy. Think of the ease with which you can slip into a high-waist ruffle skirt with elastic waistband. Or a roomy trench with rounded collar. Schoolboy blazers have patched pockets; knickers bunch at the bottom; thin white tees hang off the shoulder. Beautifully masculine ankle books look like they’ve come out of hiding from a century ago. In gray or black (quilted with slender laces), they’ll make you kick up your heels, induce toe-tapping. And all that jazz. Available at Shelly Steffee, 34 Gansevoort Street, at Hudson Street (917-408-0408); In God We Trust, 135 Wythe Avenue, between North 8th and North 9th Streets, Williamsburg (718-388-2012). To see styles or place an order, go to kellerny.com.