Hello: I'm afraid I can't answer your question re: Women's sizes, because the size I purchased is a Petite Small. However, in case it helps to know, the Petite Small is 24 1/2" from shoulder to hem. You can compare this measurement to the Petite Small measurement listed in the catalog and online for a comparative calculation. Hope this helps. BTW.... I LOVE this shirt! Actually, I LOVE the entire outfit (big shirt, tank, and slacks)! They're a traveler's dream (extremely easy to pack, easy to hand wash, and quick to dry)! Paired with different-weight tops (e.g., I wear the big shirt with turtlenecks in the late fall and winter and short-sleeved tees in the spring and early fall), the shirt is also appropriate for wear throughout the year. Very comfortable, love the side slits, and love the 3/4-length sleeves (they accommodate various style and width bracelets. Highly recommend!