I don't know if putting your wand in a pocket is such a good idea- particularly not your back pocket. Professor Moody warns against doing that. What if you wand suddenly ignites, you could lose part of your rear end. Of course, I haven't heard of many cases of that happening.

I generally keep my wand in the right hand pocket of my robe. The pockets are deep, so the wand is easily hidden. Plus the large opening makes it easy to remove it when necessary. Professor, is it a good idea to get into the habit of exposing one's wand in public like you do. What if you run into a muggle, won't you have a hard time explaining why you are wearing a wand in your hair? Also, do you really think we need to carry our wands at all times when we are in Hogwarts? After all, students aren't allowed to use their wands in the hallways between classes, and I hardly thing Voldemortist is going to be attacking us at school. Do you?