Page Six may be compensated and/or receive an affiliate commission if you click or buy through our links. Featured pricing is subject to change. From Hilary Duff going back on tour to Gap relaunching fragrances, Y2K flashbacks are practically everywhere right now. And Old Navy is the latest brand hopping on the trend. The iconic mall brand launched a beauty line last month comprised of seven nostalgia-heavy fragrances — each available as a body and hair mist, body wash or body lotion. When we found out the line was developed by perfumer Jérôme Epinette, who created iconic scents like Byredo Gypsy Water and Sol de Janeiro Cheirosa ’62, we…