When I worked for a PC, operatives using a disc cutter didnt require anything special, but the welders were just informed to wear their boiler suits and were omitted from wearing their hi-vis (unless walking around site!).

Now this was 6 years ago, so may all very well have all changed.

We are welders/fabricators and insist that all our guys wear flame retardant boiler-suits at all times. Like lawlee we have dispensation will all our customers that they are permitted to remove the hi-vis vests etc during the time they are carrying out hot works as they are not flame retardant and the area they are working in is segregated from traffic anyway as part of our safe system of work.

The standards that refer to clothing for hot works are EN ISO 11612 (replaced EN 531), EN ISO 14116 (replaced EN 533), EN ISO 11611 (replaced EN 470-1) and IEC61482. Your requirements for the PPE will be down to risk assessment based on the precise work you carry out.

I'd add that this must include people who do works such as using abrasive wheels. In one job I had an employee was doing a bit of grinding wearing ordinary overalls and the sparks caused the overalls to catch fire whilst he was wearing them.

Similar to fscott we in ship build & repair insist on hot workers overalls as the minimum for welding , burning and grinding. It does not end there, when we have fabricators open flame gouging in a tanks the spatter and ricochet can be quite immense and find its way into the slightest chink in the armour. With this in mind different processes will require different levels of 'supplementary' protection all to the standards quoted. We use leather over jackets & salopettes. Where hot work is being performed in a MEWP we also use cloaks similar to a poncho to protect the safety harness which ultimately protects the hot worker.

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Regards
Alex