I am 5' 1". I weigh 155 pounds. My bust is 42" (36 DD). My waist is 37". I am in between a size medium and a size large. I REALLY didn't know what size to go with on this top. I reached out to the girls at ByEgreis and they helped me. I ordered this top in a size large and I am SOOOO glad I did! Usually I get a size medium in most of my ByEgreis items. However, in the description it says if you don't want it cropped to size up. Again, I am so glad I did. I have a larger bust/back size too. If you're more on the petite size, stick with your normal size. It is so comfy and has some stretch to it. It is a thicker material, but not heavy/cumbersome. Love the color and style. Thanks for the help in sizing ladies!