Most of my clothing was already male clothing because (usually)when anyone bought me girl clothes, I wouldn't wear them. I had already cleaned my room and closet recently, so a lot of unused stuff had gone to charity.
A week or so after I came out, I started compiling all the remaining stuff. If it was stained, or gross in some other way, I threw it out. If it was nice, I put it in a box to give to charity. Unfortunately, the box is still sitting in my car along with some other things because we haven't gone over to the charity place yet.
I wasn't sad in general, because I hated most of the stuff, but the few things that were giving me some maudlin or nostalgic feelings I put in my fabric box. That way, I can reuse them in a sewing project so I'll still kind of keep them, just in a form I can use.
There were a few things I kept though. Mostly because they fit my style, actually fit my body, and didn't scream female.