I vote armored as well. I actually, for the old book, made an all male spear unit, and an all female spear unit. The models don't lend themselves to being bare chested.
Plus, it just seems slightly outputting. Don't get me wrong, I'm no prude nor do I judge women who would go bare. However, it just seems like gamers (especially for fantasy) are stereotyped in a way that this fits into all too well. I felt a little odd painting my Avatars of War Sorceress (I won the model), and wishing she had a cloak or shirt (even if it was revealing) on. I just think it'd look, well, hokey to intentionally make them bare chested when the men are fully armored.
If we were talking about converting Warlocks (setting aside background material as I seem to recall them being all men) into women, I can easily see them also being bare chested as the men are too. It doesn't seem out of place for the unit. When I think of most Dark Elf units, I just see them having practical armor/gear/clothes. It seems like only the Witch Elves, and Hags would really go into a frenzy where they'd charge into battle nude with reckless abandon. From a historical perspective, there were warriors (regardless of sex) who charged into battle nude or mostly nude, but the Dark Elves are a rather established empire with a fairly skilled/professional military backed by industry.
If it was an army that was a Cult of Slaanesh, and you had both sexes with lots of skin showing, that would work. It's just that if you want to do an army with a lot of boobs, I think Slaanesh (either variety) would be the army you want to go with.
It's your army, so do what you like. I'd just do a test model before committing either way.
Yes, I do look like Loki. That is me in my avatar.