This shirt is a particular piece of clothing worn by Benedict Cumberbatch's adaptation of Sherlock Holmes. The shirt is a piece that looks particularly good on him, leading many of the fandom to believe it's his "pulling" shirt - ergo; when he wears it when he wants/ is likely to get sex (usually from/ with his friend John Watson).
"Look, it's the Purple Shirt of Sex! Watson's totally checking him out."
by S. Moffat January 11, 2012
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The most famous shirt ever seen in the BBC series Sherlock
Person1: Look it's an Purple shirt!
Fan: *loud screaming* Its the Purple Shirt of Sex!!!
by Lionsie August 8, 2017
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The shirt worn by Benedict Cumberbatch in the BBC show Sherlock. First seen in the unaired pilot, then again in The Great Game
by OragamiSauce December 12, 2012
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The seductively deep purple shirt that adorns the ever so beautiful torso of Sherlock Holmes ; renowned for sending all who gaze upon it into the throes of blind lust regardless of gender or sexual orientation; a potent aphrodisiac.

It's first appearance is in "The Great Game", the third episode of BBC's "Sherlock" starring Benedict Cumberbatch and Martin Freeman.
"Please, just one button pop off, at least one...or two..." - A cumberbitch on the purple shirt of sex
by Irene A. (ConfettiJessie) April 19, 2011
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