I got the taupe and loved it so much i ordered the white and wore both this week alone! they are so cute and a great weight in this spring/summer weather we're having in the bay area. 
the taupe is a normal medium and a bit roomy, so ordered the white in a medium petite and it's pretty great. just depends upon how you like to wear it - both are lovely. 

my advice? get two - today! you won't regret it. 
order your regular size - don't size up or down!