Newmar's costume was fashioned after a green catsuit that was appearing in the comics at the time. The costume also had a mask similar to the one Lee Meriwether is wearing in the picture below.
Her costume was similar to (if not the same) as Julie Newmar and Lee Meriwether's, as they were all portraying the same character in the same cast and storyline.
Pheiffer's costume is still a stroke of genius. The half-crazy character she was playing surely would have stitched together some leather and made it work. Also, very creative.
Her costume design was based on Batman's costume from the 1989 Michael Keaton film, 'Batman'.
We still don't know what her costume was based on. Your guess is as good as mine.
Catwoman's costume is very true to the comic character currently in the comics. She's got the utility belt, the goggles (which flip up to become cat ears and a mask similar to Julie Newmar's) and lots of leather.