The representative said it was intended as a double entendre for get on your nerves.
The woman concerned was visibly upset by the remark, witnesses said.
She removed the T-shirt and left the room in tears.

Pat SharpDavid Davies/PA Images via Getty Images
It was inappropriate and disgusting … it was the talk of the evening and completely ruined the atmosphere.
Sharp has since apologized to the individual concerned.
He said: Last Friday, I made a joke on stage which was not well received.

Pat Sharp presenting ‘Fun House’
I upset one individual in particular and for that I am truly sorry.
I apologised at the event to anyone who was offended and I have apologised to the individual personally too.
Deadline is not naming the woman, though she has published a statement about her experience on LinkedIn.
Without identifying Sharp or being specific about the incident, she said she felt humiliated by the presenter.
I was belittled, sexualised and objectified in front of hundreds of people I respect, she wrote.
It is understood that she has not accepted Sharps apology.
It did not name Sharp, but said it had contacted his team to voice its disgust.
Sharp has presented for Greatest Hits since 2019.
He also hosted the BBCs iconic chart showTop of the Pops.
He finished 10th in the 2011 season of ITVsIm a Celebrity…Get Me Out of Here!