I wear Ironclad like Cementups. They are great and you can work the DIAD with zero issues using the alpha key. The touch screen is horrible with no gloves so it obviously wont work with gloves.
I have trouble using the touch screen with my bare fingers but with my gloves on I can use it with ease. The screen is actually pressure activated, unlike the iPhone which is heat activated. But I do use the orange function key (D5) more than I use the screen itself.
As far as gloves go they run normal. I wear large in everything. If you golf, go off the size you wear in a golf glove. I wear a large but I have long fingers and like them a bit snug.