a polaroid, 17 years later

I love this picture, especially since I have been going back down memory lane in my picture box. My only question is the 'denim slacks'. I have never heard denim and slacks used to describe each other. My mind read 'jeans' in place of slacks and I didn't realize it until I read it for a second time. 

----- could someone turn the world back over, I'm getting dizzy!