2nd, 6th and 7th Wisconsin, 19th Indiana, 24th Michigan
24th Michigan Monument Gettysburg Pa
Actually wood pulp was quite commonly added to clothing in that era and still is added to clothing today. It alone does not mean that a certain fabric is cheaply made. In fact many expensive fabrics are made with wood pulp and likely you are wearing cloths with wood pulp in them as you read this.
This according to my wife who just gave me a lecture on the subject of clothing and wood pulp...and enjoyed doing so far to much. I didn't help matters any by being a smart ass and asking her if cedar or teak was better for undies.