I know of one good ladies designer shop in Celbridge that is doing well and seems to have lots of nice stock in the window-its called The Designer Exchange and is on the Hazelhatch Rd.
The one in Blackrock has closed down a while. Stock Exchange are in Dun Laoghaire now; they were in Baggot Street and then Dundrum before moving to Dun Laoghaire. They are very good. There used to be another one in Mount Merrion opposite Flanagans but I don't know if it's still there.