On "Friends", what type of jeans are Joey's carpenter pants?

On “Friends,” Joey’s carpenter pants are Sergio Valente jeans.

Sergio Valente was an American designer-jeans brand associated with the 1970s and 1980s, when prominently branded denim was a major part of casual fashion. The label made jeans for men, women, and children, and its name became recognizable enough to work as a period-specific joke on a sitcom set in the 1990s.

Joey wears the pants while doing home-improvement work, including building an entertainment center and helping with remodeling projects. The gag is that his clothes are both impractical-looking and oddly fashionable by an earlier decade’s standards. His friends’ comments treat the brand name as evidence of Joey’s questionable sense of style, not as a description of a special technical type of workwear.

A common mix-up is calling Sergio Valente a cut or material, such as “carpenter denim.” It is the brand name. The question’s wording uses “what type” informally: the expected answer is the label Sergio Valente, rather than “carpenter jeans” or a generic style category.