The answer to the crossword puzzle is 'DEBRIEFS, ' which is an 8-letter word for underwear from the first state. Debriefs are a type of underwear that originated in Delaware, the first state to ratify the United States Constitution. The term 'debriefs' is derived from the fact that they were originally designed for military personnel to wear under their uniforms. Debriefs are now widely available in a variety of styles and colors, and are popular among both men and women.