### Clue: It's descriptive of Yellowstone and Yosemite but it's pants! (1-6)
### Answer: Y-FRONTS 
 ### Explanation: Definition: pants
 How to describe "Yellowstone " and "Yosemite", ie. having the letter "Y" at the front/start (or Y-fronted, to be more exact).
Defn: A form of underwear.