Lacroix is a designer that Eddy likes to wear. There are many funny references to Lacroix in Ab Fab, some of which are listed here.
"I wonder if Lacroix does kitchens?" - Eddy
"Lacroix, baby spew, Lacroix, baby spew darling!" - Eddy
AbFab -- Lacroix, sweety!
"Lacroix Sweetie!" - Eddy