Original Commentary
I was going for "two things that don't match at all". I specify what they look like so that way if we ever see Robert or Jane in these pajamas, it's kind of a bonus for people who keep track of these details - Terrence

Modern Commentary
I mean, matching pajamas pretty much says "We think of you primarily as Robert's girlfriend". Jane is a lot of things and that's one of them, but she'd be hurt if you ignored everything else about her - Terrence