Earlier this week I had a conference call for work where one of the participants showed up wearing his pajamas and a bath robe. Now I will confess that I often wear unprofessional shorts during video calls but keep them hidden under the desk. I actually keep a very nice dress shirt on the back of one of the chairs in my office. If the call warrants it, I put on the shirt and saddle up to the desk so nobody can tell what I have on below my waist.
Fortunately our meeting only included a few of us and the underdressed participant had spent the previous week ill. I don't hold his attire against him but only use it as an example for my post. Should you find yourself in a similar situation where you don't feel well, I think it would be better to just keep the camera off and explain that you are under the weather and look like death warmed over. I think your fellow meeting attendees will forgive you and not worry that you are not on camera. Furthermore I'd bet they are glad you didn't wander into the office and infect them.
One more thing probably deserves mentioning. Should you be wearing a nice shirt but casual shorts, do yourself a favor and don't stand up in front of the camera. There is the story where someone does that and everyone at the meeting sees him in his boxers. I have never had anyone do that but am extra careful not to flaunt that I am still in my cycling shorts during meetings. Along similar lines, I try not to show up for calls in my ski outfit.
