I've never seen (or heard of) an electrician wearing gloves? - certainly I never do when doing any mains wiring - gloves would reduce your manual dexterity drastically.
Latex gloves.. But even they get on my nerves... I'm lucky. I have never destroyed electronic parts with static.. I use a rubber mat to work on and that's it.
Why? - assuming you're worried about static, anti-static precautions don't require gloves - and I don't see as they would provide any level of protection anyway.
High voltage gloves are required by the US Occupation Safety and Health Administration (OSHA) and glove testing, labeling, washing, etc all are specified.
Check ASTM D120 & ANSI F496
Various glove testing service companies exist in the US. Also, you can buy a glove dielectric testing equipment if it is not practice to send gloves to a third party. The high voltage gloves here are usually a leather glove inside of a black rubber glove and sold as a set.
I wear latex gloves all the time as I get dermatitis.
They dont give much protection from electrocution though, and no use if your allergic.
Most countries require you to have a licence and a permit to work live.