Work wear hack: I think the key to jeans at work is to go very classic and top with a super-elegant, blinding-white, STARCHED shirt, like this one. And definitely a belt and good shoes to finish it off.
Unique Oversized Shirt Dress http://www.thewhitepepper.com/collections/new-in/products/black-shirt-style-long-dress Chunky Heel Brogues - also available in brown! http://www.thewhitepepper.com/collections/new-in/products/chunky-heel-brogues
Here's how to pull it off: just take an old (slightly baggy) button-down shirt, twist it wrap-top style, and tuck it in. Then use safety pins or button one of the top buttons to secure it in place and prevent any wardrobe malfunctions.