Trivia: At the beginning of each episode, those are the faces of real inmates.
Trivia: In the flashback scene when Gloria is being arrested outside her store, there is a cardboard cut out of Andrew McCarthy, who is an actor from the 80's (Mannequin, Weekend at Bernie's, etc) and also directs a few episodes. (00:32:40)
Answer: On the show, orange uniforms are worn by the new inmates, while the khaki is the longer-term population. Generally, there's no standardized meaning of the colors as every prison has their own color-coding system. For example, red could mark more dangerous inmates. Other colors could indicate lower-risk prisoners, ones with health issues, area designations, and so on.
raywest