British online fashion retailer Asos on Thursday posted a 41 per cent rise in sales over the Christmas period as reduced prices lured shoppers.Asos, aimed at twenty-somethings, said global retail sales in December climbed to £78.1m year-on-year for the month ended December 31st.Christmas sales were strongest in the group's overseas market with a 57% increase in the US and 42% elsewhere, while UK sales jumped 34%.International sales represented 54% of the total in December which was a higher proportion than the 52% the previous year.The company received two million orders from its customer base of over five million."I am pleased to report very strong trading during December with retail sales up 41% to £78m," Chief Executive Officer Nick Robertson said. "We remain positive in our outlook for 2012/13 as we continue our journey to becoming the number one online fashion destination for twenty-somethings, globally."Shares increased 0.34% to 2,663.00p at 10:40 Thursday. RD