I gave my dad this for Christmas. He is 88 years old and like many older folks he gets cold alot in the winter.  This is the only shirt he wears now!  It's a very warm and very comfortable shirt. I gave him more shirts so that he doesn't wear the same shirt all the time.  LOL.  This is an Over-Shirt. You wear it over your regular shirt or you can just wear it alone but it's mostly worn tucked in because it's a shirt not a jacket.