Originally Posted by Bart

I'm still not convinced that this was a TSA search. There is nothing in the TSA SOP that requires officers to instruct or force passengers to remove blouses or otherwise strip down to the bra.

With the term "at security" applying loosely, I am curious if this was an inspection by customs. If so, I can't comment because I don't know their procedures.

If it was TSA (and that's a big IF), then I fully agree that the OP has a very legitimate complaint. But I have yet to be convinced that TSOs were involved.