Dreaming of an apron can suggest many things.
Aprons are often associated with work, labor, and tasks ahead. If you are wearing an apron, it could mean you feel you have duties and responsibilities to fulfill. Apron strings or ribbons may mean you are feeling detached or far away from the work and be a symbol of your lack of desire to do the work which must be done.
Another possibility is that it may relate to your role in a family situation. It could be something you associate with a mother like or grandmotherly figure, ,and so the apron may remind you of this in your life. You may feel like you have the role of being a mother like figure to someone else. To see someone else wearing an apron may suggest that they have motherly control and influence over your life.
You may also feel as if you are a servant to someone, or that you are being controlled by a greater force than yourself if wearing an apron. It may be time to examine your ability to work without others.