Black Long-Sleeve Button Placket Tunic, Likely J.Crew, Size XS/S

Long-sleeve tunic top, black, with 4-button placket in front. I'm pretty sure this is from J.Crew, size XS/S, but tags are missing so can't 100% confirm. It's slightly oversized and long. 100% viscose. It's in good condition, only worn a few times.