Cotton is a fiber (from the cotton plant). Flannel is a finish or weave. Hence you can have flannel wool as well as cotton flannel - i.e wool made with flannel finish or cotton made with flannel finish. Hope this helops.
A very memorable song from Joni Mitchell that featured the line They paved paradise and put up a parking lot.. This best described places I remember growing up in Bloomington, MN in my teens where numerous places were torn down, most notably a restaurant I frequented that was replaced with a Park and Ride lot.
This is where we hear the song's title for the first time, as the big yellow taxi comes to take him away. The line, They paved paradise and put up the parking lot refers to the destruction of The Garden of Allah, a Hollywood hotel renowned for its rowdy celebration parties.