here on Etsy. They now also have the same design in navy and pink, which I think I may purchase to make another top like this, but possibly with short sleeves.
plicity 2599, is a basic top pattern with a few different neck variations. While I do like version E, I really wanted to try create a pleated neckline similar to this Emerson Made blouse. My sister has one, similar to the link, in a lovely charcoal and white striped seersucker that I just adore.
I made a straight size 8 and the only modification was to lower the front neckline by 1 inch and to sew a few tiny tucks to the front neckline, which thankfully are hidden under the pleated strip, to prevent the front gaping. I'll have to fix this properly in future if there's nothing to hide them.