Not exactly what you are asking for, but Hot Topic had some before G3 was released- sometime between G2 and G3. I'm pretty sure it has Cotton Candy on it, maybe another pony--- I just pulled mine out, realized that I should never have even tried them on (but I really wish they had fit!) and put them back in the box. If this were a conversation about shirt, it wouldn't even seem strange- but it's underwear.
I would totally try to fit into Fancy Pants underwear.