Vintage Elephant Baby Overalls Lang's Kwiki. I have no idea on a size, but these these will sit in my room only to be admired by me....
9-11.5 waist laying flat
6" inseam shoulder straps are adjustable.
Elephants are are padded :)
These came out of a hope chest from children's clothes that were around the 40's, 50's, and some 60's.