Been a lurker here for a long time, thought I'd join because I saw this. How exactly is she 6-C? Her fight with Irene was PIS, and she had several asspulls and lots of things conveniently going her way. Irene purposefully letting herself get injured, swapping to Wendy then being forced out which drained a lot of her energy. Before all of that Wendy and Erza could not even scratch Irene and she was playing around with them. Erza was buffed by Wendy and trying her hardest. Irene made a flower pattern with Erza's swords and didn't take either seriously. Biggest outlier was when she launched herself and somehow slashed a meteorite with broken bones. Not to mention Wendy conveniently waking up to enchant Erza's sword with DS magic, which had never been brought up as being possible (Would've helped during the GMG's when the Dragons attacked.) So I don't see how she could be 6-C without plot armor. If there is a reason I'd like to know just to satisfy my curiosity. As she has never displayed this power outside of PIS and/or for plot.
As for her Clear Heart Clothing it does not give her any extra strength at all, she merely swaps from focusing on defense to switch to all out attacking. "Erza has described this outfit as just normal clothes without any special properties. As her armors represented the walls around her heart, donning these clothes represented Erza opening her heart and breaking down the walls she'd built up to protect herself. While in this outfit, she discards defense, instead focusing primarily on offense." That's from the wikia and you can find the info in chapter 91, pages 15-20. If anything I think people confuse this outfit with her Demon Blade that grants her a similar ability, and even then it only allows for one strike as it uses up all her energy in doing so.
As for the Black Wing Armor that grants her flight, it does not actually grant her true flight but short flight over limited distances. "While equipped, this armor grants the user the ability to fly around for short distances." This can be found in chapter 60, pg. 9
As for her Clear Heart Clothing it does not give her any extra strength at all, she merely swaps from focusing on defense to switch to all out attacking. "Erza has described this outfit as just normal clothes without any special properties. As her armors represented the walls around her heart, donning these clothes represented Erza opening her heart and breaking down the walls she'd built up to protect herself. While in this outfit, she discards defense, instead focusing primarily on offense." That's from the wikia and you can find the info in chapter 91, pages 15-20. If anything I think people confuse this outfit with her Demon Blade that grants her a similar ability, and even then it only allows for one strike as it uses up all her energy in doing so.
As for the Black Wing Armor that grants her flight, it does not actually grant her true flight but short flight over limited distances. "While equipped, this armor grants the user the ability to fly around for short distances." This can be found in chapter 60, pg. 9