You know a lot of people are harping on Rally kids for liking a certain handful of items, but it's always easiest to identify a "problem area" when you're an outsider looking in at a group. I also think the term "overused" is debatable; the implication is that the person making an avatar should do so to please the observer instead of the avatar maker. Granted, that is the goal of some, but others may genuinely like an item.
I can say without a doubt that the Sainte items are a hallmark of the GCD. I myself am "guilty" of using it; I am in fact wearing it and Rosamund's Revenge right now. Another couple of items popular with the GCD are
Literary Luxury,
Juno's Lace,
Zodiacal, and
Pink Dragoness. Though there are users that favor these items outside of the GCD, of course, they seem particularly prolific here. That is neither good nor bad, it simply is what it is. The old standards (buckteeth, grass skirt, Gaia tshirt) arose from a time with incredibly limited choices for self expression. There will never be items as prolifically used as they were in their heyday due to the variety of choices we have now.