A housecoat is a loose-fitting garment that is worn at home, usually made of comfortable fabric like cotton or fleece. It is similar to a robe or a dressing gown and is worn over clothes to keep warm or to cover up. Full definition
If I could go back in time, I would invest in a couple of easy wash housecoats to wear indoors to save all the washing of my clothes. (rainydaymum.co.uk)
Unless you really, really plan on wearing your vintage robe or housecoat day in and day out (which, of course, there's nothing wrong with), one or two such garments, like the gorgeous floral print number in this post, will likely be enough to help you stay perfectly comfy cozy all through bone chilling months of frost, snow and freezing temperatures that we're headed into as the year winds down. (chronicallyvintage.com)
Winter housecoats and robes, while certainly more substantial than their lighter silk, satin, and thin cotton summer dressing gown counterparts, do not have to be shapeless, uninteresting beings by any means. (chronicallyvintage.com)