This has been worn and washed.

Cotton flannel, yellow, with  screenprinted Tweety design. 

Blue  vinyl binding is stitched   around the wrists and ankles, and the neckline is bound in a blue flannel.

Elastic in wrists and ankles, still stretches just fine. 

In the photos, the yellow shows differently  in several photos. It is a butter yellow.

This looks like it was made as a costume, but  may have been sleepwear. 

I cannot find any labels. 

Please ask questions! 

Measurements:   Neckline to crotch length 18"

Length from top of shoulder  to bottom ankle 30"

14.5" chest/body  circumference

Probably a size 2-3.