If you dream of wearing coarse clothing, eating raw food, or speaking harshly, it indicates that significant changes are coming into your life. These changes may be challenging for you and could create some discomfort in your lifestyle. The dream serves as a warning that preparation is necessary, and you should keep a vigilant eye on the situation.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Coarse" (page 89).
If a rich person sees himself either wearing coarse clothing, eating coarse food or speaking harsh words in a dream, it means that he will experience severe changes in his life and that will perhaps affect much of his savings. Should one feel more comfortable about such changes in the dream, or if he prefers them over his usual comforts, it becomes a sign of his humility, contentment, gratitude and the correctness of his way of thinking. Should he feel uncomfortable about such changes in the dream, it means that he will become subject to God's wrath. Exchanging coarse words in a dream means aversion between people who actually love one another.
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.