I added north road like handlebars to my loop frame bike. It came with mountain bike flat bars. It was so much more comfy and easy to steer. And was more attractive.

On my mixte I went for the veto orange left banks, which are porteur style bars, with a narrower grip and similar rise to the north roads. So far so good. I had a slight concern about going mixte and clothing choices! But in reality I typically only wear knee length stuff. I have a few pencil skirts that go below the knee towards mid calf. These aren't bike friendly anyway.

My fave bike outfit is a fit and flare dress in a breathable but slightly weighty fabric. These dresses are great! Something like this. As long as the fabric is not too light it stays put. Or I use this skirt weight.