Most of the pictures I've seen illustrating steatopygia (primarily African) showed fat accumulation on the buttocks, rather than extreme hip width.
So I'm puzzled - I had the impression that the word related to notably rear-protruding buttocks instead of pelvic width and fat on the hips (which is what I believe our thread subject demonstrates)...
Anybody have a source that could clarify?
-D'Artagnian