Then what are you even on about?
The character is nearly 75 years old and most the images you've cherry-picked are from the last 15.
• For the Golden Age, outside of being drawn "puffy" in her first few issues, she was drawn like any other woman up to, through, and beyond the Silver Age and into the Bronze and Modern Age.
• For the character's 4 years of live-action TV history (1975-1979) before millions of viewers across 59 hour-long episodes... Lynda Carter was an extremely slight beauty pageant queen. Carter even remarks in one documentary that she requested the costume be let out because her natural figure was TOO hour-glassy.
• For the character's animated TV history, Superfriends spanned 13 years, 9 seasons, and 109 episodes with a normal body.
• She was also comparatively slight in Bruce Timm's Justice League, spanning 5 seasons and 91 episodes from 2001-2006 and her 2009, direct-to-video animated feature, voiced by Keri Russell.
Sure, the depiction exists, but hardly with the same endurance, exposure, and effect on the zeitgeist as a normal-figured woman with wonderful powers not borne by muscle.