Liz Claiborne died of cancer yesterday, at the age of 78, close on the heels of fellow designer Gianfranco Ferre and magazine contributor/career discover-er Isabella Blow. If death really does come in threes, maybe this is it for a while for high profile fashion people passing away. While the name Liz Claiborne might make you think of the more matronly sections of department stores now, she was pretty kickass back in the day, and her Working Woman ensembles ruled the office in the ’70s and ’80s.