We've had two questions about the red stripes on extravehicular suits, used to distinguish between the suited astronauts. Usually the more experienced or higher-ranking astronaut wears the stripes. When there are three astronauts, a broken red "candy cane" stripe has been used. Russian Orlan EVA suits also use color-coded stripes to distinguish crew.
Do intravehicular suits (e.g ACES or Sokol) similarly have markings that can distinguish crew?
- Don't count personalization such as nametags, country flags, or space agency patches (they are not as easily recognizable as a stripe).
- An older question covers how light sticks can be used to distinguish astronauts from closeout crew in an emergency.