Numbers 15:38 "And they shall make for themselves Tzitzit"

When you see a woman wearing a white dress, white cap and white shoes - you know she's a nurse.

When you pass a fellow in a blue outfit, with a silver badge, dangling a baton, you can tell he's a policeman.

Tzitzit is the Jewish uniform.

It is a four cornered garment with eight knotted fringes hanging from each corner which all Jewish men and boys must wear.