might they be these http://www.modthesims.info/download.php?t=192465
I do have some other pjs in my game that are purple with purple bottoms and slippers and have a pregnancy morph...they are part of a set that also includes a light blue pair. I was convinced they were either by Fanseelamb or Tiggerypum but I can't find them on MTS. I'll keep looking if you want me to...