Papal etiquette

I'm attending the installation Mass of Pope Francis tomorrow, and I am unsure what to wear. Should I wear my habit with the thick cord? Or would it be better to wear my habit with the thin cord? Isn't there some rule about "No thin cords before Easter"?

Also, am I expected to bring a housewarming gift? Maybe a cake or a casserole or something? I guess I could play it safe and just bring him a nice potted plant.