The Wicksteed are a bit dull and some of the Erdem ones are really not flattering.
I quite like the polka ones. I think Kate looks best in casual, simple day or stunning evening looks. The fussy day things such as prints or overly tailored items less so. She looks great in dark, bright or jewel colours but not wishy washy, dull colours/things (few people do!).
Here's two wishy washy prints I saw today that I didn't like. One is Erdem!