By Siddharth Cavale NEW YORK (Reuters) -A handful of apparel retailers including Levi Strauss are teasing more full-priced products, testing how much wealthier shoppers are willing to pay despite the sobering effect of tariffs. They have not been disappointed so far. Levi's raised prices on some products in July but saw no slowdown in demand, the denim maker's chief financial officer, Harmit Singh, said at the Goldman Sachs Global Retailing Conference in New York on Wednesday. "We are making a full-cou ...