Tim
My brother, who has a medium size office cleaning company in Exeter, has all his staff kitted out in either polo shirts or tabards, it portrays a more professional look, and looks tidier to boot!
I worked for him as a supervisor when he first started, and some of the cleaners that turned up had to be seen to believed!, muddy boots, wellingtons and ripped clothes, it just doesn't look good at all, especially in prestigious offices.
Regards........Jake Dillon