What to wear to the hospital?

Tonight, Guh-Guh read to Margaret and got her ready for bed. As they prepared her for bed, Mom explained that she needed to go to bed just in case EO had to go the hospital tonight. Margaret announced that, "it might be cold" she insisted that she needed a sweater to wear and that I had packed one. She even told mom the sweater was pink, then blue then she said it might be red then she stated "might be white." After not finding any sweaters (WHY would I pack a sweater in 90 degree weather??) she decided to pick an outfit. She picked what mom said is the outfit that has the most material to it---is this a stretch?? Not sure....however, most of the shirts I brought her are sleeveless and this one is not and is longer than the rest.
I will definitely take a blanket or maybe a sweater =-) if we go to the hospital to prevent my child from being cold since she was so worried about it!