Apparently a crinoline could be as wide as 225 inches …. HUGE yet the average 1860’s ones i am looking at were between 90 and 105 inches. While there is also some complicated math equation to work it out, for example, if your waist is 28 inches you X that by 90 which is 2,520 which you then divide by 26 which gives you 96.9 meaning the width of your crinoline will be 97 inches. I have no idea how this works, does make me want to learn maths though. The impressive page is here.