Luvable Friendsbaby-girls Dress and Cardigan

Do these dresses have a built-in bodysuit?

What size is 4T ??

Is it possible to just buy the cardigan? I have plenty of dresses for my little girl but I would buy all of the cardigans in a heart beat!

I ordered my product and it never arrived. I checked everywhere and asked my neighbors. I tried to contact Amazon, but dont know how to cancel this no