Women may wear non-tznius clothing at the pool, by ones spouse or in front of other women-only, with no men present, too.
Yes, that was my point. In those contexts, the clothing is not non-tznius! On the contrary, in those contexts the clothing is perfectly appropriate.
You responded “Not true” to the comment that “Singing ladies aren’t tznius”. On that basis you should be claiming “Not true” to a comment that wearing immodest clothing isn’t tzniusdik.
In most contexts, the clothing would not be tzniusdik. In that you’re correct. But there is a time and place for them when they are 100% appropriate and proper. The same applies to women singing.
The Wolf