We're witnessing the rise of The Prep once again, and we couldn't be more pleased with its timing. Our closets are already stocked with button-ups and prep-school accessories like satchels and bobby socks, so we're always on the lookout for separates that help us channel our best Margot Tenenbaum. Keller's fall 2010 lookbook schools us in all the right techniques, with some Upper East Side attitude courtesy of NYC based designer Kelly Clark. We're also all about the no-frills black leather jacket and deeply saturated olive-green coat just perfect for playing teacher's pet. Also, it's all in the details: Prim white buttons, a smart rope bolo tie, and carefully worn-in socks prove that it's the littlest factors that make an equation work. Click through for all the looks that's going to have you re-enrolling in back-to-school dressing come fall.