Dutch artist Suzan Visser has created a series of wonderful works with baby birds wearing hats. Included in that series are these owlets wearing nightcaps. Available as a postcard or as a notecard with matching envelope.
 
Postcard Size: 5-3/4" w x 4" h
Notecard Size:  6-3/4" x 4-1/2" h
 
Postcard:  $2
Notecard:  $4.25