3/4 sleeve cropped open cardigan

Open front cardigan by 89th & Madison. Wide ribbed collar folds over all the way down the front. Tag with size and fabric content missing. Estimate a small to medium, please compare measurements to determine fit. Based on a sold listing on Posh for this same sweater, I believe this is a rayon/poly blend, and it is machine washable. Fabric very smooth but fairly substantial. 21" shoulder to hem, 18" pit to pit, 12" pit to sleeve cuff. Excellent condition. Questions? Ask away!