Pfeifer wasn't what I had hoped for Janet, but I'll reserve my judgment for when I'll see her in action. It could end up working just fine.
As for the hair and he outfit, I do believe this scene takes place in 1987-ish, and both the hair and the outfit are something Jan would have worn in those comic book years (although the hair is a bit longer than what Jan had which, if memory serves, has never been longer than the shoulders).
A bit disappointed they didn't take the opportunity to bring Hank closer to comic book canon and make his hair more fair