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The Draco Trilogy started the trend of portraying Draco as a tormented emo boy (instead of the racist schoolyard bully he is in canon) and is the source of many associated fanons. It includes one scene where he wears some borrowed dragon-leather trousers, which for whatever reason was seen as so iconic as to become a metonym for the flattering portrayal as a whole.
Suddenly I'm... still rotating Fallen London in my mind even though I've stopped actively playing it.That "whatever reason" probably being Hell-Bent for Leather, a trope where leather attire is worn by a character to be coded as appealing, cool or even sexy.
135 -> 180 -> 273 -> 191 -> 188 -> 230 -> 300 -> 311DILP is about trends of the works fandom to whitewash characters (sexiness is one reason hence "Leather Pants") which goes under the original works page. Specific works doing it are Adaptational Heroism or Adaptational Nice Guy.
i'm not familiar with harry potter, but the trope name reads fine to me. "draco" sounds like "dragon" or "draconic" (which evokes evil, like The Dragon), and "in leather pants" indicates that the "draco" looks cool, classy, sexy, etc. in this situation. it doesn't quite evoke the full idea of "evil character is glamorized and their misdeeds are glossed over", but i think it gets most of the point across. (honestly Ron the Death Eater has a similar problem but worse for me, since if not for it being a YMMV trope i'd imagine it as a counterpart to Tom the Dark Lord.)
The name is a bit annoyingly narrow (or tight?), since the "leather pants" thing makes it seem overly focused on "this character is sexy, therefore they can't be a villain," even though the sexiness factor is only one possible reason for DILP.
The question's been answered, further opinions on the trope are for Trope Talk. Bear Trope Renaming Guidelines in mind.

I understand the meaning of the trope itself. I'm just curious about how it got it's name.
How exactly does re-writing a villain to make them more sympathetic translate to them wearing leather pants?