** Shares of U.S. retailers fall after President Donald Trump said the U.S. is calculating a massive increase in tariffs on Chinese imports, fueling concerns over likely impact on sourcing supplies

** Apparel retailers Gap GAP.N, Nike NKE.N, Ralph Lauren RL.N, Lululemon LULU.O down ~2%

** Abercrombie & Fitch <ANF.N>, American Eagle Outfitters <AEO.N> down ~3%

** Shares of electronics retailer Best Buy <BBY.N> down ~4%

** Toymakers Mattel <MAT.O>and Hasbro <HAS.O> fall nearly 4%

** Levi Strauss LEVI.N down 12% after flagging high costs linked to U.S. import tariffs

** S&P 500 Consumer Discretionary Distribution & Retail Index .SPXRT is down 2.5% on Friday

(Reporting by Neil J Kanatt in Bengaluru)

((Neil.JKanatt@thomsonreuters.com;))