What pants exactly are slacks talking about?

pu1. I was confused, so I looked it up
Originally called in the United States, it is called "Traughts" in England. Recently, it refers to a slim one for women that comes up to the calves. Casual practical pants are usually worn for sports, work, and home wear.
[Naver Knowledge Encyclopedia] Slacks [slacks] (Fashion Specialized Data Dictionary, August 25, 1997, Korean Dictionary Research Institute)
That's what they say

2017-10-30

OK

pu2. It used to be called base pants, but it's like a suit pants with wide thighs

2017-10-30

OK