Trapo is the common Spanish word for “cloth” or, more commonly, “rag”.

It sounds nothing like the similar words in English, except… it turns out to be a close cousin of drapedrapery.

All come from the same old Irish word, drapih, meaning, “garment.”

We can see the parallel in the t‑r-p and d‑r-p mapping. Both are the same roots except for the t/d shift, which is a very common and not-noteworthy transition.

A drape, after all, is a form of a cloth.