Since this is off season, my idle mind started thinking- how many skaters have had a season when they won every competition they entered? Irina's 2004-2005 season came to my mind immediately. To make it fair, I decided that in order to be considered, the skater should have competed in at least 4 competitions, including GP's, nationals, worlds, Olympics, cheesefests, Europeans and 4CC.
Here is what I came up with.
Irina Slutskaya 2004-2005 (already mentioned)
Michelle Kwan 1995-1996
Michelle Kwan 2002-2003 (she entered just 4 competitions- Campbells, SA, USN, worlds)
Gordeeva-Grinkov 1993-1994 (SC, Euro, RN, Olympics)
Mishkutionok-Dmitriev 1990-1991 (not sure about this one)
Grischuk & Platov 1997-1998
Ilia Kulik 1997-1998 (not sure)
That's all I can think of right now.