BERLIN (Reuters) -German retail sales dropped more than expected in December, data showed on Tuesday, as tighter coronavirus-related restrictions hurt trade in textiles, clothing, shoes and leather goods. The Federal Statistics Office said retail sales – a volatile indicator often subject to revisions – tumbled 5.5% on the month in real terms, compared with a Reuters forecast for a fall of 1.4%. “The December decline is probably related to the fact many retail outlets have started asking for proof of COVID-19 vaccination or recovery, and the impact of seasonal adjustment due to Christmas,” the…