I use the regular photographer gloves from off the shelf at Heny's, the only label on them is Keep in Touch" You can poke your index finger and thumb out through slits in the gloves. In really cold weather I wear thin wool gloves inside them. The ones with the rubber grippers. Then we have a larger set of fluffy insulated mitts to put on in case our fingers get really cold and need to be warmed up. And we also carry
chemical hand warmers that we can activate and slip into the gloves or mittens, in case of a real disaster.
The mitts usually stay in the camera bag, but sometimes they are needed.
When it's cold out, prepare for anything that can happen.