Outfit details:
For reference, I'm 5'8", 145 lbs with a more muscular build. At Lululemon, I typically wear a size 6 for tops and a size 4 for bottoms. I tend to carry more mass in my quads and glutes, but still prefer to size down for bottoms that feature a higher rise so that it fits my waistline better. For a fit that hangs a bit more loosely (e.g. joggers or certain types of shorts) I stick with a size 6.
Nothing major to report here! All in all, these are reliable pieces and good investments. I've only recently gotten into the OS Scuba and do want to point out an issue I have with fit. I think the sleeves are a tiny bit short. I'm on the tall side, but I don't want to size up because I like the fit of the XS/S. It doesn't bother me all that much, but if you have longer arms, this is worth keeping in mind.
Feel free to comment if you have any questions and I'll do my best to help you out!