User blog comment:DevilX90/I'm Confused About Pink Hoodie Mac.../@comment-25047959-20140702111857

I think Sakurai wanted to show two more alternate costumes for Little Mac with that image ("Training Mac" and "American Flag Mac"). I mean, it's pretty obvious that they are in their fighting stances. And about the animation where he removes the hoodie, he could simply do the same animation without removing it, or even get a new animation.