I could explain it or I could just show it to you instead. Actually, I think showing you would make more sense.

[ Because she doesn't really know how to explain it. Magic was never her strong suit. So with a swift touch of the gem on the ring on her finger, a bright light envelops Kanaya, replacing her clothes with an outfit much more suited for the title of magical girl. But of course, showing it off like this makes her uncomfortable, as she was never much of a model despite her love of fashion, making her uncomfortable shift her weight back and forth. ]

Does this explain anything? At all?