I imagine if you weigh at home your special clothes would be your birthday suit--I know that's what I would be wearing.
I weigh at the WW meeting, so I have to be fully clothed. I have been wearing a lightweight pair of drawstring pants (something I used to wear when my size 20 pants were too tight) and a short-sleeved T-shirt. The pants are pretty baggy, but I'm still wearing them only on weigh-in day. I don't think I have anything else as lightweight to wear. At least I don't take my watch off to weigh!
Anyone else have a set of clothes they weigh in?