Vintage Rocky Mountain Western Shirt Women's M/L Blouse Concho Horse Artist EUC

Beautiful Vintage Western Blouse. Rocky Mountain Clothing Co. Rare style!! Side button style...with 3 decorative Concho buttons. Small black buttons below. Size tag is missing. I think it is a Women's Medium/Large...see measurements below. Silky lightweight,  rayon/ cotton blend I guess. Maybe all cotton, very soft. Measures: Pit to pit 20" Shoulder seam to cuff 23.25" Across back Shoulders 21" Front edge of collar to bottom 25.5" Great preowned vintage condition. Deep black with purple,white, green, yellow and orange. See photos. Any questions please ask. Thanks for looking!