By Makiko Konohara Tokyo, March 12 (BridgeNews) - Japan's department store sales in February likely remained sluggish, because sales of spring clothes were weak due to cooler than normal weather during the month, a survey conducted by BridgeNews showed. The February sales data are expected to show an on-year fall, following a 1.5% decline in January, because there was one less business day in February compared to the same month last year, a leap year, survey participants said.