If you have ever had a coat on then you know how they make you feel, warm. That's what a coat is, or that is one of the main traits that make up a coat. It's their primary purpose even, to keep the wearer warm and feeling good when it is cold and harsh out. This is why coats exist. Coats are also designed in some cases to help keep out wind and elements of the weather too, so they you don't get wet or that the strong wind don't get inside the coating of your coat and make you colder than the air outside does. How do these traits factor into dream interpretation though? We're getting to it.
If you have a dream in which you are wearing a coat while it is cold outside, but the coat is keeping you warm, then this means that you are about to be kept alive by a lifeline. Everyone has one of these things even if they don't actually call it that. It is one of those contingency plan deals that makes it okay for you to go out and not have to worry about something. Maybe you're trying to go out on a limb and make an investment and the just in case thing is your CD that you keep locked away so that the amount doesn't depreciate. Maybe the figurative coat is something else of importance to you that would help you get through the harsh times like a savings of money in the bank, some extra food, etc. Whatever the case, a dream like this suggests that you're going to need to use that safety plan soon, but all will go over well thanks to careful planning and preparation.
If you have a dream in which you are trying to use a coat outside but the wind is still getting in or the weather is still affecting you despite your coat, then this means that your safety plan is going to fall through. Even though you've been setting this plan aside from when you had to use it the most and you thought that you had everything in order, it turns out that you didn't. You're now going to get yourself in a whole mess of a pickle and it's because you relied on things that you shouldn't have and were unable to deliver like you should have.
If you have a dream in which you are outside wearing a coat on a warm day, this means that you plan for failure to an unnecessary degree. You don't have to worry about things going wrong all the time especially if it inhibits your ability to enjoy the present. Ignore your inhibitions and go on living without them. If you have a dream in which it is cold outside but you have no coat then it means that you have not prepared well enough for the bad times and now you are about to experience them in full force. Be ready.
A coat is a seriously important piece of clothing for you if you are out in a cold environment. What would you do without it? This is an important thing to remember to take with you. And if you have a dream in which you forget a coat then this means that you have a very important thing to remember in the waking world and this is your mind's way of keeping it fresh in your memory.