TOC: 8: On Leo: Adidas training pants, $40; adidas.com. Eastpak backpack, $60; nordstrom.com. On Mae: Uniqlo jacket; uniqlo.com. Adidas Originals Kids track jacket ($50) and track pants ($45); adidas.com. Eastpak backpack, $60: eastpak.com. Vans slip-on sneakers, $35; vans.com. On Ali: Erdem jacket ($2,230) and camisole; erdem.com. Gucci pants, $1,700; gucci.com. Prada bag, price upon request; select Prada stores. Manolo Blahnik for Carolina Herrera pumps, price upon request; (212) 582-3007. On Cass: Thom Browne sport coat ($1,980) and skirt ($920); thombrowne.com. L’Agence T-shirt, $95; lagencefashion.com. Balenciaga bag, $1,250; Balenciaga, NYC. Socks by Ozone Socks, $30; ozonesocks.com. Sies Marjan oxfords, $795; similar styles at siesmarjan.com. Tailor, Christy Rilling Studio. Cover look: 8: Dress, $8,150; select Tom Ford stores. Manicure, Megumi Yamamoto. Tailor, Christy Rilling Studio. Editor’s letter: 14: On Chopra: Sézane cardigan,…