From J Peterman:
When Sabrina was in France going to cooking school and soaking up some savoir-faire, one of her many mentors took her to an exclusive shop and bought this jacket for her.
(The part of the movie you didn't see.)
She'd button it all the way up when she wanted to appear innocent, which she was.
She'd unbutton when she wanted to be less innocent.
She had gamine down pat.
As, of course, the actress that inhabited her.
When she came back to America, it took a while (men are so dumb) but it was reason enough for Humphrey to leave his company behind to his charming, hair-brained brother, to be with Sabrina, her jacket, and experience everything he was missing.
I found this in Paris and it could be what you've been missing.
50's Sabrina High Button Jacket (No. 2490). An A-line in a soft brushed cotton double-breasted cut that ends exactly where it should. You'll work that collar as she did. Six real horn buttons. Two pleats on each side and inverted box pleat down center back enhance line further. Did I mention it was fully lined? Or that you would look splendid in it?
If you've ever wanted to cut your hair short, this is the jacket for it.
J Peterman is one of my favorite catalogs to browse and actually read because all their product descriptions are like the above. If you have a moment, take a spin on their site or better yet, have them send you a catalog. It's an experience in itself.