Wine glasses (and some fancy beer glasses) have stems to help keep your drink at the right temperature.
While there's no shame in holding your wine glass however feels most comfortable, if you hold it by the stem the heat from your hand won't warm up what's in your glass. From here.
Until about five minutes ago, that little pocket was called a 'change pocket'. It's for keeping your change in.
btw: Levi's used to be a symbol of durability. Levi's used to last like leather. Now, Levi's are no more than a sad, sad excuse for clothing. The scumbag CEO advises people not to wash them because of the wear and tear washing will put them through. I have flannel pajamas more durable than Levi's. Funny tho, that kids keep buying them. smh.