It's a more nuanced term than "black" or "brown" and implies a certain warmth and richness to the person's appearance.
Here are some English equivalents that capture the essence of "trigueño":
* Tanned
* Sun-kissed
* Olive-skinned
* Brown-haired
* Dark-skinned (but not as dark as "black")
However, it's important to remember that "trigueño" is a more specific term than any of these English equivalents. It carries a certain cultural and aesthetic connotation that can be difficult to fully capture in English.