How much longer will the slashed-shredded jeans stay in style?

This morning after coming back from shopping I saw an older teen standing outside in 33 F. Degree weather, drizzling rain & windy...she was wearing slashed jeans, no coat and had a fleece blanket wrapped behind her to help keep her warm...the front of her legs had no blanket over it...I imagine she was freezing....those jeans are not practical in winter.