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But I've learned that all cadets and staff at the US military academy West Point have been officially encouraged to wear jeans that day - and in fact the email they got about it explained the history of this solidarity action better than the official site does:
"all of West Point is encouraged to wear jeans to work as a visible means of protest against the misconceptions that surround sexual assault. Denim Day was originally triggered by a ruling by the Italian Supreme Court where a rape conviction was overturned because the justices felt that since the victim was wearing tight jeans she must have helped her rapist remove her jeans, thereby implying consent. The following day, the women in the Italian Parliament came to work wearing jeans in solidarity with the victim. Since then, wearing jeans on Denim Day has become a symbol of protest against erroneous and destructive attitudes about sexual assault."
Well since the military rarely wears jeans, and has a serious sexual assault epidemic, I would be happy to see them all wear jeans on this day. It would be particularly striking if they wore uniforms on top and jeans below!