Definitely dresses and skirts for me! They're so much more physically comfortable, flattering, and easy to fit that it's bled over into psychological comfort.
On a deeper level, I'm not remotely tomboyish or action-oriented or briskly no-nonsense. I'll take a good book and a deck chair and something tasty to eat over anything that involves running around any day. So skirts and dresses just feel more right to me and less like I'm trying to be something I'm not.
That said, I hate feeling like my clothes are restricting my movement too. So I look for fabrics with give and things that generally don't feel fussy.