Hmm, good question. I sat a job interview the other day with my preggy belly there for the world to see. I went shopping for a new shirt (with a collar and buttons) but couldn't find anything in the maternity range that looked nice - I looked more like an Easter egg.

I ended up wearing trouser pants, a nice long top and a bolero. I wear that sort of outfit every day at work, so I didn't feel particularly formal - but I'm lucky in that I was applying for an internal job and the "dress code" at my work is fairly lax at the best of times.

So, hmmm...I think what you've chosen sounds fine. If you're wearing a jacket then I don't think anyone will notice what you're wearing (ie. that it's not a "suit"). The other thing is that in my experience being on Interview Panels, it's the people that go overboard (with make-up, clothes and perfume) that we remember for the BAD reasons, and people who present with a great personality and answer the questions well that we remember for the GOOD reasons. So as long as you feel comfortable and confident, I think that's more important than what you're wearing.

Good luck! FWIW, I got the job I was applying for, so it certainly had nothing to do with what I was wearing!