Lingerie 
To dream of wearing lingerie signifies your sexual orientation, preferences, and self-image. You may be finally embracing a part of your personality which you have previously neglected.
To dream that you are buying or shopping for lingerie indicates that you are distracting yourself from the sadness you feel inside. It is possible that you are in the process of enhancing your self-image.
Backdoor
If you are inside a house or building when a backdoor appears in your dream state, you are most likely looking for an easy way out of a situation. People are more inclined to escape through the backdoor when they feel don't belong there in the first place or they prefer to stay reserved for personal reasons.
If you are outside a home or a building facing and looking at the backdoor, you will be soon involved in finding a solution to an issue that is unconventional or morally questionable.
Lingerie Store
To dream of visiting a lingerie store symbolizes a sexual atmosphere.
To dream of shopping in a lingerie store indicates a desire to reconnect with your feminine side.
A dream in which you buy lingerie for yourself may also indicate that you would like to appear more desirable to others.
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