Many variables to consider. Some people aren't naturally smelly. Some folk have a naturally strong body odour - no matter how much they scrub. Your occupation and environment play a aprt - sitting around in overheated rooms, working hard under pressure, labouring in cool temperatures and relatively clean air - all will affect how your body sweats, and the type of scent exuded. The 'smell of fear' (no giggling at the back please) is a real phenomenon, as severely frightened people have a signal sweat response. Another operative factor is how often clothing is washed that is in direct contact with the body.
Find some of the books about the original Jack the Ripper investigations, as the police reports on some of the victims concern people who had never washed or changed their clothing.
erm....this isn't a bit of a 'thing' you're exploring is it? AB isn't quite that 'specialist'.....