I love these nightgowns and their only problem is that they hold up for too long! So there you are wanting a new color (BTW: how about something in Green!) but the the ones you bought four years ago may be a bit faded but are otherwise in great condition! Better flannel and much better attention to detail than a once famous brand, unnamed here, whose quality has taken a nose dive. I'd suggest ordering one size smaller than you'd normally get because they are generously cut.
A warm but lightweight winter gown, soft and attractive. I combine with other layers in really cold weather--like silk underwear, a fleece vest in the morning until I get dressed. But it's also fine by itself in somewhat warmer places.