I am 6'2" and 155 lbs and ordered this dress in a medium but probably would have been fine too with a small. I wasn't sure from the description, but this is a complete wrap dress, meaning there's lots of flexibility in size (I had worried the small would be too tight at my waist if it wasn't adjustable). The waist line fit me perfectly which is rare! Because I ordered the medium, there wasn't much of a slit and the dress could be wrapped more tightly (i.e. conservatively) around my chest. What I like though is that if you loosen the tie in the back, the front cross becomes looser/ sexier. I like that there is this option to change how the dress looks (and to tighten it for dancing!). Overall great quality. As said in other reviews, the fabric is heavy which I prefer and I still found it quite breathable for being at a hot outdoors wedding. I hand washed it after, and was able to get a small stain out this way, so am extra happy with the fabric.