90% of Kate's evening wear is fabulous, as are her tour wardrobes.
Her day wear would improve if she:
wore more separates; especially flowy pants,
got her proportions right (bin those wide legged culottes and flippy short skirts)
Accessorise more
She likes solid colours, so she should take some risks and colour block.
Eg start with bright accessories. Navy dress with fuschia shoes or something