I am not an expert at this, but I THINK it depends on the type of electrical work you do...
I did a quick check and this is what I found.
Hazard/RiskMy employer wants me to provide proof of some documentation where it is required for electricians to wear cotton clothing. I know about Arc-Flash category #1 but i am talking about T shirts, trousers, etc.
Please pass on any information you can.