Why are they all 180cm ? In B&Q and Tesco every shower curtain is 180cm by 180cm. WHY ? I want a shower curtain that is just over 200cm. I don’t want 360cm of it. I don’t want two. I just want a shower curtain that is long enough. Obviously though some unwritten law means that I will have to do without. It’s not like my demand is that unreasonable because you can’t get any smaller either! All are 180*180. Where did this measurement come from ? Why does it persist ? Is it tied into bath design ? Are plumbers in on this conspiracy ? 180 cm – it’s a daft number. It’s not quite six feet, it’s not two metres. Why pick such a non-number for such an essential piece of bathroom equipment ? It can’t be to do with trimming down because if you want smaller you have to do that. Stupid. Bah.