I ended up ordering the Small instead of XS because that was where my measurements fell on their size chart. I ordered from the Cuddl Duds website. My order came today, and the Small in the lounge pants and top fit perfectly. I probably could have worn the XS in the pants, but the Small pants are fine and very comfortable. They are very soft and warm, so I'm happy.
The Bluebird Carries The Sky On His Back"
-Henry David Thoreau