I usually wear a tank top with an inbuilt bra thingy, and tight pants (3/4 leggings or full length ones). Cause then things are less likely to jiggle.
Ditto but I wear a sports bra as well!! I hate to jiggle!!!
I like to look ok when I go to the gym, most people at our gym do make some effort. And nobody really cares if you do or don't but I find it gets me in the right frame of mind. If I am dressed for the gym, I go to the gym and then I work hard.