Here's Tilly and the Buttons' Mathilde. I love her details: tucks, button-down back, blousy sleeves, and bateau neckline.
The downloadable pattern includes only basic instructions, but Tilly offers step-by-step construction details and photos on her blog. She also provides thorough instructions on how to shorten the sleeves, add gathers, remove the tucks, and make a dress-length version. You get a lot with your pattern purchase!
I used a lovely, autumnal cotton lawn and brown pearl snaps (idea from Make Something). I sewed a size 3 with size 1 bust darts, and the fit is just right.
I did make a few very minor modifications: sleeve cuffs have no interfacing and are sewn with 3/8-inch seams; the neckline has bias binding, no facings; and I added 1.5 inches to the blouse length.
I will definitely be making more! I have some Joel Dewberry rayon set aside for a short-sleeved, tuck-less version.