I do this in the belief that the darkness does, to some degree, hide the full extent of, for example, the glossiness of the leggings.
Anyway, I was running on the outskirts of a town nearby and was running on the pavement alongside the rig road of that town. I was running with the flow of the traffic, so all cars were coming from behind me.
At one point there was a pedestrian crossing at which some people were crossing which bought all the cars next to me to a halt. I passed the crossing, A few seconds later some cars went past me but then there was a gap. It didn't really register at first but then I realised that there was a car keeping pace with me and effectively holding up the traffic. I looked at the car and the occupants were looking at me. They gradually sped up.
It's the first time that I've had such blatant attention paid to me which makes me think that something must have looked obvious. I took some photos after the run and unless the leggings look a lot more feminine than I believe they do (and let me know if you think they do) then the only explanation is my bra.
Here are the photos taken after the race.
My worry is that under the t-shirt I wore a sports bra. As you can see from the above photos by the end of the run my t-shirt was completely wet from sweat. However, that takes a while to happen and it's a slow process. What I have discovered happens is that the t-shirt starts getting wet but the bra stops sweat getting through for a while with the result that you end up with a dry 'bra' shape. Here's a photo I took on another run a while back which was when I discovered this.
I suspect it's quite possible that I was running alongside a road with many cars on it with quite a visible bra outline. I really need to be a lot more careful I guess.