Well, if it’s fashion, you’re going to need to see the clothing, and its textures/patterns/details/etc. So, for contemporary/conventional fashion, direct sun, at that time of day, outdoors, is probably not the best option.
On location, I would either find a source of open-shade, or create one using large grids, diffusion panels and flags. Check out what Peter Lindbergh has done here (click this).
If that kind of equipment/production isn’t available to you, finding a place like in the shade of a tree or building is going to open up a lot more opportunities for nice even lighting, that you can then use something like a silver reflector to get some pop-y highlights off the model’s skin as well.
If you’re hellbent on using high-noon, direct light, know that it’s going to be VERY VERY contrasty; along with increased shutter-speed and aperture, I’d also suggest using an ND fader (like this one).
…and I’d also ask the king of high-noon direct light himself how he does it, as I’ve never been much good at controlling it: click here