What did cook wear?

an apron or chef's whites.

An apron

They wore robes that was different solid colors because of the different areas they came from.

I'm not sure but, it is possibly NO.

Cooks wear aprons so that they don't contaminate food while preparing it. Also it keep food off them so they are clean.. so there food dunt tase of t-shirts or you get hair in the food that would be...