Don't size up with this set. I am 125 lbs and bought the size Small and the shorts have plenty of give, which I love. The top is beautiful - it's oversized - but in a very comfortable flowy way. I've been wearing this set every night - it's my new favorite PJs. My only complaint is that the top button is set very low and allows a LOT of cleavage. For a bustier person, this might be fine, but I don't have much on top and so I feel like it really needs another button higher than the top button. It's not a deal breaker as I'd still buy another PJ set, but I am also a seamstress and I'm 'this' close to sewing in another button hole and adding that top button, it bugs me that much. Otherwise, I'd recommend this PJ set - it's beautiful and the fabric is a quality weight for satin. I'll likely buy another set, and thankfully can add an additional button to the top to close the cleavage gap from being midway down my chest.