I'd say if you are traveling without checked bags, then have as many clothes layers as possible - a tee, a light bouse, a light sweater, a light jacket, a heavier jacket - this will cover you for all sorts of emergencies and you can wear it all together when boarding a plane.
Dresses are wonderful, but just pack one pair of jeans as well, that'll be useful on many occasions.
If the weather is a bit cool, I simply wear tights with my dresses, this way I can still dress up a bit and not feel cold.
Hope you enjoy your trip to Europe!
Great to hear you can cover your expenses with blogging alone!