Depends where you work but I would not do boots and tights.
I would do dress pants (brown ones) with long heels.
I would also do a scraf in brown or another color because the neckline seems a bit low. You can also do a blazer or a sweater and take it off for the evening if you want.
Dress pants with long dress...hmm... wouldn't that make it look like shalwar-kameez?
But yeah scarf is a great idea. Thanks.