Katie Holmes in Isabel Marant at the Z100 Jingle Ball 2013

Well, if you simply must wear a sweatshirt on the red carpet, we suppose this would be the best way to do it:   Katie Holmes attends the Z100′s Jingle Ball 2013 held at Madison Square Garden in New York City in Isabel Marant. Isabel Marant Shiloh Cotton Sweatshirt It helps that it’s a really …