I always find it funny when people talk about grunge as a fashion look. I was a teenager in the 90s, and grunge was all about the music. The clothes were just a sideline to the music. Amongst my friends, if you dressed in grunge clothes, but didn't listen to grunge music, you were pretty much branded a poser.
The two best things about grunge fashion: 1. it was comfortable. 2. it was cheap!