Perhaps your diet and not your cycling is affecting your smell? I've had to skip some days in past summers even in the heat for various reasons & even then smell was NEVER an issue. Also, I find that it's way better to be a lil chilly vs warm in terms of dress. If you're warm before setting off, it's a sign you're over dressed for riding unless it's way below freezing outside in which case sweat is your least concern. If you have big quads & calf muscles like I do, you're going to generate a LOT of heat pedalling even if it's low effort. So, diet & attire should be your first focus. Secondly, if you get on a train, take some outer layers off, because often the train or station will be way warmer due to collective body heat & the systems onboard the train like brakes and HVAC radiating up from under the car. Another sidebar there ... On hot days, try to stay away from the part of automobiles between front and rear wheels, as the radiant heat from exhaust pipe will add to the blacktop, sun, and ambient air temp.

Lots of ANTIPRESPERANT deodorant will do you good as well....

Keep your legs well exposed to air unless it's very cold, let your neck, hands, and forearms be exposed to moving air as well. Loose clothing that can breathe helps a lot too.

Finally, try to put some baby powder in those closed up spaces, socks, underware for example. It will absorb a LOT of smell if it continues to be an issue even after following above tips.

Hope that helps!!

- Andy