Book: Children's lockstitch
Fabric: Various knits from the Fabric Fairy
Sizes: 90, 120, 140, 150 (not included I graded up)
These were quick to sew up but I can't say the pattern was a sure go like most Japanese patterns. Maybe I should have gone down a size for each child but I found the crotch lengths too long in addition to both the sleeve length and shirt length.
It may be also I'm used to more fitted knit pajamas, the boys aren't complaining though, in fact I think they found them more comfortable.