In my office they are, and I've started wearing them. I just make sure the denim is dark and not in any way distressed, and that the rest of my outfit isn't casual. This summer, I've grown fond of wearing skinny jeans with a flowy dressy top, nice sandals and jewelry. When the weather cools down, I'll switch to boots and either add a vest or jacket or wear a pullover sweater.
For me, the key to surrendering my waistline and wearing a flowy dressy top is to size down and make sure the top doesn't have too much fabric, if you know what I mean. I don't want to look pregnant. It's been difficult to find such tops, but they're out there. You just have to keep an eye out for them.
Good luck!
