Don't bother. Just don't take a tag, it's that simple. Angel tree/TFT are for people to give new toys or clothes to children who may not get much on Christmas morning. They do not want you old, worn out clothes and raggedy stuffed animals.
EDIT: I do not (and never did) have to use Angel tree ot TFT.
Ok I have a question since u seem to know all the proper etiquette. My dd picked two names off the tree and the ones she chose she did so because it was the same name as her and her sister. Anyways, one girl asked for an easy bake oven or a gymnastics Dora...both of which I can't afford. So is it ok if I get another age appropriate toy? I just wasn planning on spending $40/$60 on on ONE toy...
I can say as someone who used to get toys from the angel tree that you are dead wrong. When you are a kid who has nothing, everything counts. If people do what you say, there will be a whole lot of kids with absolutely nothing on Christmas. I would rather get an old toy and used clothing then nothing at all.