An entertaining story here about how some well-meaning Victorians unwittingly misled millions of people for nigh-on 150 years:

How Victorian restorers faked the clothes that seemed to show Hadrian’s softer side

As always, this sort of story leads one to wonder just how common this sort of well-intentioned mistake is…  I suspect this isn’t the first or last example to come to light, although no doubt some museums would have been sorely tempted to have just kept quiet about it.