1) Chinos 2) Pants 3) Trousers 1) KC lass wears these 2) Alternative to a skirt 3) At Saks, Elsie bought a pair 4) Casual pants 5) Casual wear 6) Chinos 7) Denims 8) Goofs off 9) Informal garment 10) Informal trousers 11) Jeans 12) Khakis 13) Leisure pants 14) Pants 15) Pants for casual wear 16) Pants suit part 17) Pantsuit part 
Slacks is a common term used to reference pants or trousers. This term is generally restricted to dress pants, usually of the pleated variety. `Slacks` in reference to loose-fitting trousers is a term that has been used at least as long as its first recorded use in 1824. ...
[n] - (usually in the plural) pants for casual wear
noun (usually in the plural) pants for casual wear