To wear an overcoat in your dream suggests that you are shielding yourself from life's hurt. You are putting up a proverbial wall.

To dream of an overcoat, denotes you will suffer from contrariness, exhibited by others. To borrow one, foretells you will be unfortunate through mistakes made by strangers. If you see or are wearing a handsome new overcoat, you will be exceedingly fortunate in realizing your wishes.