I've never understood robes either. My husband loves his, to the point it's only about 2 years old and is falling apart already. I also don't wear pajamas - I do have pajama pants, but those are for lounging around the house, and I just wear a t-shirt or tank top to bed.
Currently, I'm in a light pink maternity top with 3/4 sleeves, unbuttoned jeans (definitely wearing maternity pants on Thursday!) and pink socks that used to be fleece but are now on their deathbed.