I have bought quite a bit of thrift store outdoor gear over the years and was quite taken to see this post and the replies. I have found name brand gear, often brand new and never worn for only a little money. The best strategy I have found is to shop in the off season. If you are looking for long underwear or a base layer, look in the summer when it is really hot. If the item comes into the store, chances are no one is interested and it will be available. I have found some great summer clothing this time of year as well. Hope this helps and happy hunting.