Questions & Answers about La ropa puede encogerse.
In Spanish, ropa is usually a singular collective noun. It refers to clothing in general as one mass/category, not as separate individual items.
So Spanish says:
La ropa está limpia = The clothes are clean
La ropa puede encogerse = Clothes can shrink
This is similar to English clothing, which is also grammatically singular.
If you want to talk about individual items, you would use a plural noun such as las prendas, las camisas, los pantalones, etc.