Safety Recruitment I Have An Interview On A Work Site And Am Not Sure What To Wear, Any Ideas?

I have an interview on a work site and am not sure what to wear, any ideas? - safety recruitment

The agency told me to wear closed shoes for safety, but was not sure if I did not dress and may lead to. The position is for an apprentice boilermaker, Interview with the care team, which is displayed on the site and the weather is hot and humid 38 degrees Celsius.
Thanks