Wonder Woman began in 1941 as the alleged good feminism image. A symbol of beauty ＆ strength for women, doubling as soft-porn for nerdy boys. Her image ＆ story has mutated thru the political climate, just as Captain America has. Nowadays, with the evil communism era gone, and her Snow White chest and skimpy costume being too feminine to be sold as a butch dyke for gender feminists, the image of Wonder Woman returns to her natural role of being primarily a blue-eyed sexpot.
At the age of 41, in 1982, Wonder Woman started to wear a double W on her chest, instead of the bird. Here's a excerpt from wikipedia:
In the preview in DC Comics Presents #41 (January 1982), writer Roy Thomas and penciller Gene Colan provided Wonder Woman with a stylized “W,” on her bodice, to replace the eagle. The new emblem, unlike the old, was copyrightable and so had greater merchandising potential.