Reading the title, I wondered for an instant in what way body temperature was related to being bullied or not.
I imagine being 'hot' can help not being annoyed by bullies (they could be somehow intimidated)... but then being 'hot' one would probably be annoyed by admirers or wannabe friends or just plain wankers. Would that really be better? I'm not sure.
I'm not hot and I'm old-ish, and I also don't give a crap about bullies—I never hesitate to more or less nicely tell a bully to go fuck themselves when I have to—so I may not be the best informed ;)
Not all of them, there a few different types of bullies but I would say the majority of them are just weak people that like to focus their frustration on other persons they don't think could get them into trouble (either by replying or by being able to make them pay in any way). And by dressing differently you're sending a message they can read as an opportunity to bully you with little risk.
But then it depends who they are, other bullies won't change at all because you change your look.
Not knowing you nor what's happening exactly, I can at least say I feel for you and understand your frustration. Those kind of things should not be happening in a functional society.
What may help is try spending your time in other places. I live in Paris, it's really far from being the worst city in the world and if most Parisians are indeed constantly angry people, they rarely bite. Still there are some sectors I will try not to spend too much time in, some where I would not put out any cash, and so on. I know it can be a pain but changing habits can help.