lavender I can't get the image of a frog in a biker jacket out of my head!
I'm sure that this image does not apply to you, though.
Seriously, I think you should really go for it. Contrary to what your dm and df say, I think makeup makes you come across as less vulnerable, not more so. I never go anywhere without mine, but to me, wearing makeup is like a mask I use to defend myself: it gives me strength.
If you are getting lots of unwarranted attention perhaps you are coming across as vulnerable without realising? I always remember Marilyn Monroe and how vulnerable she looked without makeup and props. With slap and dressed up, however, she looked far less so (even though she obviously was, underneath.)
The point I think I'm making is that, imo, women who "make an effort" are likely to be perceived differently from those who don't bother. To me, at least, they look as though they value themselves enough to invest time and energy in looking good, which gives them an air of confidence. Confident-looking people are less likely to be messed with, imo.
Coming back to biker jackets, yes, I think it is quite a ballsy, no-nonsense look. Go for it!
I don't think it's for me, though. I think I'd end up looking like Suzi Quattro' s fat sister.