Being nosy I spoke with a gate agent about his, he told me that what ever the uni was treated with was the issue.
Some type of anti wrinkle, anti stain chemicals. Claimed after 5 washings or so they were fine.

They are all buying the black uni with their own cash though right?

Going to be some unhappy people when they can’t wear it.

Always someone not happy w uniforms. ...

The health issue did seem real though for some folks.