Banana Republic Patterned Textured Sleeveless Top XS runs large Button Detail

I'm in love with this red and white subtle knit pattern on this top. This can be dressed up for the office or worn casually with jeans. Great quality thick material mostly cotton blend with spandex for stretch. My favorite thing about this top is the darting on the bust and button detail down the back that really elevate the quality and structure of this top. Banana Republic Size XS seems to run large. I'm usually a Medium and I can fit in it. Measurements in the pictures like new condition- no flaws