The topics from the KS pattern that has been one of my most used patterns ever as the top is sometime for sleeping in and other times for sleepwear.
Did the top in flat construction where all ribbing applied in the flat then seams are stitched. I threaded the serged-seam-thread back through the seam when done and it's holding up well. And trust me this kid is tough on his clothes!
The pants are from the book. Another favorite pattern.
Fabric for the top is well aged from Uni days while the pants fabric was picked out as a gift from Imogen at Unique Textiles, a locally owned shop.