
My apartment is clothing-optional. I don't always tend to remember that many/most of my friends are ok with this, and my default when there are people there who don't live with me is to remain clothed.
This time of year, this matters less, because I leave my apartment fairly chilly (read: 60 F unless my roommate or I are sufficiently cold to want to turn it up to 65-ish) for cost reasons, and am therefore too cold to want to be without clothing.
For people's future reference, if you are someone that I am comfortable specifically inviting to my place (parties are a hazy area for me, as far as that goes, and I've only ever had a couple of those anyway), you are someone I'm comfortable enough with that you being without clothing in my home is fine. I will probably not remember that people are comfortable in reverse, though, so unless I or my roommate actually thinks to ask, I at least am likely to remain clothed (although when it's sufficiently humid out, I am more likely to think to ask).
An exception to this is probably if I have family visiting. I may have grown up in a clothing-optional household, but I know that at least some of my siblings are not comfortable with that idea. But don't worry; if I have family visiting, I will say so.
And, as a result of that poll, I'm having a random and not terribly serious thought about having a party solely for random clothinglessness reasons. :) (not terribly serious because this is the wrong time of year for me to hold a party!)
[edit] Also not terribly serious because I'm not sure I'd _want_ to hold a party for no other reason than that. Much as I like y'all, hosting parties is a bit stressful for me!