This is a SLIM FIT shirt, and VERY long (which I prefer). My bust measurement (listed below) puts me between a size Medium and Large. I purchased a LARGE in Misty Merlot. Note that I also purchased the short sleeve version of this shirt at the same time, in a MEDIUM. You'll find my review for that one here: https://www.amazon.com/gp/customer-reviews/R3RYE3O8V3V3DW?ref=pf_ov_at_pdctrvw_srp
While I was happy with size MEDIUM for the short sleeve shirt, my decision to purchase a LARGE in THIS long sleeve shirt was influenced by other customer reviews that said that this one runs tighter than the short sleeve one (basically, there's a good chance you might want to size up). After trying this one in Large, I found it to fit similarly to the short sleeved one in the bust, but a TINY bit roomier in the waist and hips. So ultimately, those reviews didn't match my experience, but I must stress again that the difference isn't major enough for me, I love it and I'll keep it.
My stats: Age: 30s | Height: 5’ 3” | Weight: 135lbs | Bra size: 34D-DD (37") | Waist: 29” | Hips: 39” | Shape: pear
Top details: Dry fit material. The diagonal seams by the shoulders is flattering on me, adding the illusion of some extra width. The shirt is cut slim and long, so it hugs the body, which is important to consider if you prefer loose fit styles. Interesting texture on the trimming of the collar and sleeves, as you can see in my photos. The logo on the front is as subtle as it appears in in the seller's photos. The color is well represented in the seller photos. Please see my photos for other details.
Hope my review helps you!