But a pink triangle wasn't something you wanted to be wearing back in the 1940s, because it would have meant that you were in a f*****g Nazi concentration camp.
Back when the Nazis were trying to figure out what kinds of people were deserving of life and settled on "white, blonde, straight, German" as the basic criteria, they realized that there were kind of a lot of people who didn't fit that mold for one reason or another. This presented a problem -- how could they easily distinguish between people who deserved to die because they were Jewish, those who deserved to die because they were gay, and people who deserved to die because they looked at you funny?
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The logistics of mass genocide are truly a nightmare.
The answer they came up with was to attach color-coded triangles to prisoners' shirts so that the worst people in history could easily identify the crime and therefore decide efficiently how bigoted they should be against the wearer. So Gypsies got brown triangles, common criminals got green, and homosexuals got pink. If you were a Jew in addition to any of these other categories, you got an extra yellow triangle, and God help you.
Himmler loved him some cheat sheets.