Thank you. I'm very aware of the differences between the popular usage of the term in less authoritative sources vs. the Diagnostic and Statistical Manual itself.
I would like to return your attention to the opening paragraph of the Wikipedia article you provided and invite a comment in your own words on two sentences:
"Sexual fetishism, or erotic fetishism, is the sexual arousal a person receives from a physical object, or from a specific situation."
"Arousal from a particular body part is classified as partialism."