I'm 112 lbs. and 5'4". I ordered a Small and it was too big overall - and not in a good way - so I returned it for the Petite P which is perfect. Interesting weight fabric - a little heavier than expected. Lovely neckline, a real winner!
Perfect fit, just like as shown on the model. Sleeves are 3/4 and length doesn't fall too long, which to me is perfect with A-line skirts. Would love this exact same in a sweater version.