AS A KID growing up on 2nd Street in South Philly, Ian Morrison enjoyed the spectacle of the wild post-New Year's Day Parade celebrations that unfurled in his tight-knit neighborhood. But what he looked forward to the most was the day after the parade. "We'd steal everything the brigades threw out, the makeup and the costumes," laughed Morrison, 39, dressed from head to toe yesterday as his makeup-heavy drag-queen alter ego, Brittany Lynn. Morrison, City Councilmen Jim Kenney and Mark Squilla, and several members of the LGBT "Miss Fancy" Brigade gathered at the Mummers Museum, at 2nd Street and Washington...