Caroline....
The AFO's don't show under the legs of my jeans if the leg has enough flare below the knee. (because there is a strap that goes around my upper calf) They're really thin and fit into many of my shoes, but the style of shoe has to have the correct sort of support or, even if the AFOs fit into them, they don't help me walk.
I pretty much just wear them in a pair of air Nikes, and a couple of different boots. I have a pair of oxford style dress shoes that they work well in, but I think over the long run they will distort the shape of the shoe. So, I've just been using a cane when I'm wanting to look more dressed up, and have to walk much. The biggest advantage is they help me propel forward, but I don't feel stronger and my calves perhaps even feel weaker after I wear them. The ones I have are made of carbon, and are lightweight, but don't give as much ankle support as a fiberglass style does. The PT and also the orthotics fitter, felt that the style that offers more ankle support would make more work for the rest of my leg, which was not good either.