Mika wears this outfit instead of her normal clothes when fighting or training for certain reasons; for starters, it wouldn't be a good idea for her to fight in a skirt, so she wears this when doing anything she shouldn't be wearing a dress for. Not only are these clothes for fighting, but these are also her casual clothes. Not saying her normal clothes aren't casual, it's just that Mika finds this outfit more comfortable than her regular outfit. More often than it, she will wear this more than her regular clothes. Underneath her jacket is a white t-shirt with a pink heart on it.