I would wear the tank top tomorrow.. If the Sup says a thing, get a shop stewart, and then have the sup explain to you and your rep the problem. When he claims females can not wear them, and men can. say OK.. You then have to make a decision. 1) wear something else and keep working, and while working go to your local EEOC office with names dates and witness names as well and file a discrimination charge 2) keep wearing the tank top, and then you may get fired, file a grievance, and then go to the EEOC and file a charge of discrimination, again take all documentation, names dates etc. It would be best if you and your friend did it together to strengthen your case.. This girl here has been at UPS for 26 years and has seen how they discriminate against women. Stand your ground, stand tall and dont take that crap.. If men can wear tank tops, you should be able to as well. If the guys at the hub have a problem with you wearing one, they need not look at you. If they can not control themselves by seeing a women in a tank top, they need to get some help as they may be threat to society. Are you in G'vill SC ? I grew up there.. Be strong Girl !!!