Here’s why I’m not the person to ask such questions, in case you missed the note…
…BUUUUT it just happens that the very first submission to this blog was a very comprehensive article my friend wrote about Sisters of Battle, especially Sisters Repentia.
In short, Warhammer 40k is pretty ridiculous by definition, but regular Sisters have surprisingly decent armor (for the standards of such setting, that is), with the only major fault being the boobplate…
With Sisters Repentia though, as much as the idea of redemption by death is interesting, there is no reason why their death-wish outfits need to be the skimpy, pants-lacking, physics-defying… uh, this:
Edit: Valuable comments by yanavaseva
replied to your post:
And these aren’t even the most blatant sisters repentia outfits I’ve seen. As of regular sisters of battle, sometimes they are drawn with high heels, but on the other hand, sometimes they have helmets and not a boobplate, so this balances it out.