Where's your 'go to' shop for non casual tops?

[HarrySnotter]

I want something a bit dressier than my usual t shirts but can't really see anything I like. If you're looking for a 'nice' top, where do you try first?

Zara. Nice shapes and fabrics.

Karen Millen.

Mint velvet

Whistles for me at the
Moment

Whistles. Maybe Jigsaw. But definitely Whistles.