I try to remember it like this.....ropa or clothes is already a plural word by definition. Cloth is what clothes are made of but there will never be just one clothes. In other words there is no singular state for clothes. This is what makes sense to me and keeps me straight when answering the question. Hope this helps.
sharonda- mi is possessive adjective : mi perro, mi gata. Mí is a pronoun : always after a preposition, este trabajo es para mí/ this job is for me.. tu is possessive, tu hijo/your son, tu casa/your house. Tú is a pronoun for you informal, singular, second person. tu comes/you eat.
Again, problems over plurals in different languages. We have seen "mi ropas" on the screen meaning "my clothes" in english, we all know that adding a "s" makes a word plural in spanish & english;so surely "mi ropa" means "my clothe", I know i'm not mad cos 100 people say something similar.