|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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Dragon-skin coats or cloaks are expensive clothing crafted from the scaly hides of dragons. They are known to be extremely hard to come by, as dragons are rather hard to capture and control, let alone skin.
Dragon's skin can block, or deflect, almost all spells; as a result, a dragon-skin coat makes the wearer invulnerable to most spells.
Sometime before the 1992-1993 school year, Cuthbert Binns acquired one of these, by means unknown and would give it to Fred and George were sporting these black coats at the Funeral of Albus Dumbledore.