This one is all about the face. Jennifer Garner's face has a very distinctive shape, and it's easily recognizable even when it's as heavily disguised as it is here. She's gone to so much trouble to cover up her appearance with glasses and her hairstyle that it's a little like Clark Kent disguising his 'Superman' alter-ego; which is appropriate, considering that Garner grew up to become Elektra! As for the sweater? Don't hold that against her. That's what everyone who grew up in the 1980s looked like once.
Before she was Elektra, millions of us knew and loved her as Sidney Bristow in 'Alias' - a role that she played for five years before making the seemingly-permanent jump from Hollywood. That's where she met her ex-husband Ben Affleck, with whom she has two children and still enjoys an excellent relationship despite their divorce.