@blackhole
it think a better way to look at this, if we're going to determine If scripture has anything to say on the matter, is to determine how scripture views nakedness and whether or not a woman going out topless is a form of nakedness.
scripture sees public nakedness as shameful. are we going to say that a woman going out with no top is not her being naked? if it is, wouldn't this be shameful?
we can't use cultural norms for this as going by cultural standards can potentially justify any action as cultural norms are malleable.