This outfit is a good one for a casual business office. A lot of offices around here prefer laid-back styles, and this outfit matches that atmosphere exactly.
The sweater can be changed to many different colors in this kind of outfit and still look good. For pants, I like choosing light grey as it tends to match many top colors.
It's very important to know your size for this kind of style. When each item is slightly too big, even an expensive item does not look "right." The good news is that if you know your sizing well enough, your items look good no matter what the price.
Alternatively, you can put a white button up shirt or plain white shirt under this sweater to bring a different color to your neck line.
I hope you are enjoying this beautiful fall season.