When I was little, my family attended a nearby church popular with bikers. Sturgis was an annual missions field for them. I don't know for sure, but I think some had been part of the outlaw biker scene prior to embracing religion. Ben Stone the Bad Quaker (website now only available on the internet archive) tells stories of drug running with California biker gangs in his autobiography. That's pretty much the limit of my knowledge of biker culture.
Wardrobe may imply a woman's intentions, but she is never "asking for" assault. At least, that is how I was raised.
Absolutely. There's a museum that has an incredible permanent display of "what she was wearing." it's so disturbing as so many of them are children's pajamas, stained with blood.