Dressing gowns and bathrobes are very similar. The purpose of a bathrobe is to be worn post-shower or bath to help absorb the extra water from your wash. If you're the kind of person who wears their towel around the house, a bathrobe can be a great (and more secure!) option. They're generally very absorbent materials. Conversely, you wear a dressing gown in lieu of real clothes. For example, it's perfect for wearing over your pajamas in the morning before you change, or as a relaxing option when you get home when the work pants come off. It's also great for wearing over your underwear as you put on makeup and do your hair. That way, stray powder or hairspray doesn't get the clothes you're planning on wearing all day.