Is there a term for those large, half-cocked hats with flower-like embellishments British high society seems to favor?

Is there a term for those half-cocked hats with large flower-like embellishments British high society seems to favor? I'm seeing quite a lot of them watching a live stream of the Royal Wedding, and would like to call them by their proper name.

Solution 1:

You mean the Cocktail Hats?

EDIT:

Then maybe:

• Capeline;
• Cart-wheel hat (When "basic", this is without flowers though);
• Gainsborough hat.

The list is taken from here.

Solution 2:

I think you could call them Derby Hats (although this is also a synonym for bowler hat when applied to men).

Depending on which side of the pond you stand, that could mean either

• Kentucky Derby Hats in the US or

• Epsom Derby Hats in the UK.