Colette Jasmine pattern 1018. This is a pretty feminine blouse with a little less finicky stuff than you'd expect from a pretty blouse. The contrast tie can look a little nautical but some of us like that. I've seen it with a navy bodice and cream trim and thought it looked great. Based on the large sample on Flickr and Pinterest, I think it looks best when the fabric has a little bit of body and isn't too flimsy.
They suggest l"nearly any lightweight fabric"...silk, crepe, silk twill, cotton shirting, lawn voile, batiste, swiss dot. The fabric requirements and notions are listed in the images here, please check carefully and measure yourself before you select your size.