To dream of a leather jacket represents an assertive indifference or insensitive persona. Protectiveness or defensiveness that is insensitive. A part of you that puts up a fight, or cares little about others feelings. Doing what has to be done no matter what.
Negatively, a leather jacket may reflect an insensitive, rude, or dangerous attitude.. Areas of your life that you will cause you to insult or harm others if threatened. A leather jacket may also reflect cold or unpopular decisions you've made that require you to ignore complaints or others feelings.
Example: A man dreamed of seeing a strange man in a brown leather coat. In waking life he was quite old and insensitively speaking about dying to friends and family more often than usual.