I've noticed a pattern over the past few years of sitting in on interviews that more and more women are going for the shift-dress with smart jacket look. I think I'm going to opt for this too, mainly on the grounds that I can wear the dress again and again without feeling self-conscious in it (formal parties/conferences/dinners etc) whereas a suit I'd rarely get use out of, and seems like an 'extravagance' when I could spend the cash on books!!