Because of the communication rules in the third circle, characters in gravity tend to prefer certain colours of clothing. Colour choice and which clothes have which colour, can basically loosely translate to who they are as a person. But normal human characters aren't really aware of this.
Red - Authority
Orange - Determination or motivation
Yellow - Getting overexcited
Green - On the side of nature
Blue - Spiritual power
Purple - Corruption, instability, or the immesurable power of a god
Pink - life, blood, royalty, leadership
Brown - Humble (or literal sickness if the creature is magical)
White - Waiting for instruction in this area
Grey - Have made decisions but wiling to hear other sides
Black - Devotion/responsibility/stiffness
Places on the body:
Head/neck: What you say out loud. May contradict with what you actually think.
Torso: Actual morals/beliefs/opinions.
If sleeves are a different colour to the torso: How you recieve events/perspective on stuff that happens to you.
Trousers: Where you want to go in life, work, and personal goals.
Shoes: The absolute foundation of the core of your being.
Contradictory colours or many colours on one item of clothing (excluding stripes) means more chaos.