When Anne Marie Blackman isn’t attaching Christmas lights to unsuspecting knits, she’s sewing on furry Santas and searching for the tackiest, boldest, over-the-top vintage holiday wear she can find.It’s ugly Christmas sweater season and her customers are in a frenzy to buy.As the proprietor of MyUglyChristmasSweater.com – a Vermont-based business Blackman started five years ago when she wa