This outfit is referred to as Cécile's Recitation Dress in the Play Scenes & Paper Dolls set and is the dress AG chose for the 25th Anniversary Cécile holiday edition mini doll.
The dress hits all the marks: lovely, good fit, period-appropriate, easy to get on, suits Cécile's personality with its combination of dramatic color and feminine finishes. I agree that the accompanying pearl necklace is too long and should hit at the neck seam, and have adjusted it accordingly in the first photo below. I wish that the skirt was more generously cut so the crinoline and a petticoat would fit comfortably beneath it, and so it was long enough to hit at mid-calf when wearing the appropriate undergarments. I've more or less given up on AG making skirts long enough, though because the company skimps on fabric most times.
Grade A for a beautiful dress. It looks especially nice with Cécile's white gloves from her accessory set, even if book-Cécile can't be bothered to keep her gloves on!