March Baby Shower Dress Dilemma

My sister's baby shower is this weekend and March is such a tough month to dress for me because I'm over my winter wardrobe but it's not warm enough for my spring one yet.  I have a few dress options and would love your opinion on which of these options I should wear -

#1 - Amazon Dress 

dress / shoes (similar)

#2 - Lilly Pulitzer Dress

#3 - Amazon Pearl Collar

dress / shoes

#4 - Target's Who What Wear Polka Dot Dress

dress / shoes (similar)