No tag but looks to be a medium see measurements

This Ralph Lauren women's T-shirt features a classic striped pattern with a round neckline and short sleeves. The shirt is made of cotton and is machine washable, making it easy to care for. It is lightweight and breathable, making it suitable for all seasons. The shirt also has the Lauren Ralph Lauren logo as an accent.

The shirt is a size M and fits regular. It is a basic style that is perfect for casual occasions. The shirt is part of the Ralph Lauren women's brand and is a modern and classic piece.