Whenever you purge an overly-large collection of anything, it's also a good idea to do some thinking about how you got there in the first place: "What am I doing that has resulted in my having two drawers full of tees that I don't wear?" It could be buying things that turn out to be unflattering, having trouble passing up a sale, anxiety about letting things go, etc.
Once you figure that out, you're well on your way to not ending up in the same place six months from now...
Do you want to post some photos and have us help with the "what to keep" decisions?