powerset concept...

Okay. Seems good, but seems to overlap a bit with the Widow/Fortunata defense sets...

For better or worse, this is impossible as our hit box does not have directional discernment. This is why Shields can grant AoE defense.
Further more, high defense sets tend to be light on the resistance to reduce risk of soft capping as well as getting even near hard capping resistance. It's also, painfully, why defense bonuses are so common and can be quite large whereas resist bonuses are rare and meager.

Hmmm, might wanna make it a bit more generic than a "suit", also, notice how most sets that use lots of defense tend to rarely have heals, much less full on revives, even in support sets used by defenders, MMs, corrs, and controllers this is the case, there are balance reasons for this, so it might be out of the question.
Finally, it doesn't entirely fit into the theme of the set, maybe as a "I had good enough foresight to prepare something in case I get hurt too much." or "I prepared for that last attack enough to survive." but all in all, it still feels kind of... fringing.

A fascinating idea, but the closest I can think as to how it could mechanically be done is a melee ranged taunt that then gives a very brief (but hopefully sizeable) damage and possible ToHit bonus.

An additional suggestion I might make is to include the Widows' Foresight auto power, as it does match the theme you speak of.

Originally Posted by Samuel_Tow City of Heroes is a game about freedom of expression and variety of experiences far more so than it is about representing any one theme, topic or genre.