In New Leaf, Isabelle changes her clothes from Summer attire to Winter attire in the second-half of October, specifically on the 17th of October. Isabelle in general may be a somewhat messy person, as Digby, who claims to be a neat freak, notes that while she isn’t too messy, it’s enough to get on his nerves. While he is at The Roost, Digby may mention Isabelle’s coffee preference, and compare it to his own.