Disneygirls Frozen Minnie Princess 3 Pack Nightgown Nightgown (pack of 9)

I saw that these are flame resistant. Are they treated with chemicals or are they just flame resistant because they are polyester?

does this come with 3 doll size gowns too?

Is size 2 the same as 2T??

Do all 3 gowns come in this order?