Even if it isn't in my head it now is.

We know that Mikey hoards jackets, so I figure that Mikey's had the SoL jacket all this time, and after finding Mikey sort of stroking it one too many times Alicia prises it out of his hands and tells him it's time to let it go.

So it's put in a pile to go to Goodwill, and Gerard comes along and sees this awesome jacket, and takes off with it :D