Here you say that you should wear one level higher than what you would wear at work. So if you can work in jeans and sweatshirt, the slacks and twinset would be just fine.

If you'd work in slacks, than the skirt and blouse would be fine.

I would also think black silk is too up-dressed.

But of course there are cultural differences at well. PM Sara (Edwina's secretary), she's a HR consultant. (And she gets up early )