The adult surprise jacket is a version of the baby surprise jacket that can be knit in any size with any thickness of yarn.
It is suitable for any age, from the time that babies outgrow the baby surprise jacket all the way up to adulthood.
Spun Out 1 from Schoolhouse Press
Knitters Magazine #60, Fall 2000
Knitting Workshop by Elizabeth Zimmerman
The Opinionated Knitter by Elizabeth Zimmermann. This book also contains the pattern for the baby surprise jacket
Other Websites of Interest
The Zimmermania community blog