Vanessa Hudgens is definitely boho-chic in her floral printed dress and extra long, solid cardigan. You can get a similar look right now on Badjoan.com with the following combos:
The Postella Sheryl Dress in Feather Print goes perfectly with the Purp7e Robe Cardigan in Eggplant. The purple sweater picks up the purple accents in the print of the dress.
Another great combo is the Postella Lima Dress in Black/White Paisley with the Purp7e Long Ruffle Cardigan in Olive. The olive cardigan picks up the green in the print of the dress.
Or you could go for a contrasting look! Try pairing the Itsola Ruffle V-Neck Dress in Blue Print with the Purp7e Robe Cardigan in Brown. Blue and Brown is a classic combo and both the dress and the sweater are darker tones of these colors which complement each other nicely.