User blog comment:FairyRaven/Fairy Tail Chapter 365: Fairy in the Jail!, Review and Commentary/@comment-13876472-20131228153322/@comment-5268982-20131228164051

In fact no, she didn't have to remove Erza's armor at all. If she can enhance the sense of pain Erza feels, applying it to her face or legs which are already sensitive areas when it comes to pain would work fine. In fact, those areas are more pain-sensitive than the upper body. You get my point? No more skin needed to be exposed. As for the cuffs, Erza has been seen actually buying the armors, so they are not a product of her Magic. Mashima had absolutely no reason at all to make her clothes disappear >_>