By Astrid Wendlandt PARIS (Reuters) – Christophe Lemaire has spent the past three years designing dresses for Hermes. Now he wants to develop his own brand and ride a wave of investor interest in new labels which have the potential to become global brands. He's not alone. Whether it is private financing or takeovers by major luxury groups like LVMH, the latest trend in fashion is to find a promising niche label that has no history but plenty of imagination. …