M&S Petite Modern Pink Blouse

This sweet short sleeve blouse by Marks & Spencer (a British brand I believe) is perfect for the office or brunch. Likely polyester (fabric content tag is removed), this top has an exposed back metal zipper. Marked as a 10P, the length is a true petite 19”. Bust is 20”. The waist is pretty boxy. Please measure your arms - I find them small at a 12” circumference which is why I’ve never worn this. I’m assuming 10P UK which is 6P US.