Workplace appropriate dress?

I work in a call center and we say our dress code is business casual. That is a stretch of the imagination, but even so, a young lady came to work in a skin tight t-shirt that said 'objects under this shirt are larger than they appear.' She's worn it before and I always thought it inappropriate for the workplace but kept my mouth shut. One of my male coworkers told her yesterday it was not appropriate and she said that she didn't care and that she'd worn it before. He said it was suggestive and she may be inviting offensive behavior such as someone asking her to show them that the objects are larger than they appear. She stated that would not offend her. She said she was justifying. Her 'chest' is not large, but she wants people to know she has more than it looks like she has. My question is...

As a Subject Matter Expert (Floor Supervisor), do I go a step further and talk to the management about how we've gotten too lax about the dress code?

Under the circumstances, that would be appropriate. The young woman in question would be crying "sexual harrassment" if the gentleman had worn a shirt that mentioned his genitalia. Her response to the man who objected also fit the bill of "sexual harrassment" in the office place. She sounds like a lawsuit waiting to happen--not only against her, but against your company. You have to be fair to both sexes and squash this kind of behaviour promptly and consistently. CYA and talk to management.

Ask her to show you the objects so you can make an informed decision

By all means. The problem should be addressd before too many others begin to take it to extremes.

Yes,cos it is upsetting the workers.

Yes, if people are lax in ome respect or towards one policy they will be lax towards others.

Casual dress is not too difficult to pull of, have them enforce it.

And do not let an employee create an environment that might elicit sexual harassment, that is not good for anyone.

plain and simple Yes.... she is obviously a self esteem case looking for attention and call her on it. Let her know that those clothes make other people uncomfortable and she will be disciplined. That shirt could be fun at a party or a bar but not at work.

Absolutely! People need to have standards in the work place. You have every right to question this. Without standards you have chaos.

If I were you and you do not have the authority to speak to and correct her behavior directly (forcing her to dress appropriately) then I would speak to management. I have been in your position two times in my career and once the woman was eventually fired for her attire and the other was laid off then filed sexual harassment charges against the company after losing her position there. By the legal definition she was sexually harassed, however by that same definition she also harassed men there. But the company is the one responsible and they will be the ones paying any lawsuits so it should be brought to their attention along with an explanation of your concerns on potential consequences of inaction.

Absolutely yes. What if she left work and went to a restaurant or (or library for that matter) during her lunch hour and someone asked her where she worked. Dressed like that she is a poor representative of the company you work for. You will probably have to develop more stringent policies like, tee shirts are allowed but may not contain suggestive or insulting messages. If she wears it again, ask her to go home and change. You have every right to control what your workers wear. By the way, business casual to me suggests, slacks and COLLARED shirt for men and skirt/slacks and blouses and appropriate shirts for women. People have gotten way out of hand with the 'business casual' definition. It is supposed to be work, not a picnic in the park.