Let's see, I think we booked in July, so I guess I started in......July!!!
I use a wicker chest to store stuff in. I packed all the things from our last cruise that I knew I wouldn't be using like my Hawaiian outfit. Then, I hit the end of the summer sales and just put everything in the chest. I do this for my ds and myself and even a little for dh (Hawaiian shirts).
Now, I just have to take out half before I pack!