This is a seamless version of the BSJ . You will need the original pattern for the A-B-C-SJ from Schoolhouse Press as this variation references it.

Here are 2 videos I hope will help.
These are notes on the 2 circ method of the variation.
A KAL for the Seamless BSJ started July 1,2009 on the Baby Surprise Jacket forum

The pattern is free but a donation to The Shriners Hospitals for Children as a ‘thank you’ would be greatly appreciated.