“I am wearing green. But I’d have to drop trou and pull it out to prove it.”
We had Hawaiian shirt Friday at my last job. I was even issued a Hawaiian shirt complete with company logo on my first day. It stayed in its plastic bag on my desk for a couple months until someone finally swiped it. For the first few Fridays people would ask me where my shirt was. I cooly told them, “Sorry, I don’t do that sort of thing” and eventually they left me alone to my cold, bitter, unfun self.
Haj
I’ll wear stunt costumes to work even when it isn’t a costume day. Tuesday, I basically copied Belle’s blue outfit from the beginning of Beauty and the Beast.
I wear a Kimono to work about once a week. My MIL makes them for a living, and I get a new one for every Christmas and birthday. I have six different ones, so I don’t have to repeat for a month and a half. Today’s was white with a red and gold dragon stiched on the front.
My students think it’s cool, and the other teachers think I’m a little weird.
I don’t mean to get personal, but how do you sit in one of those?
Stunt Costume day???
I’m so going as Evil Kenivel.
Chalk me up as another one who will not wear a particular color/costume/theme just because someone proclaimed it to be “red day” or whatever. If I feel like it I will, if not, don’t browbeat me or judge my collegiality (sp?). As a matter of fact, don’t keep making me participate in activities designed to make us one big happy family. It ain’t gonna happen. There are some folks I work with who I consider friends and some I wouldn’t cross the street to say hi to. Like the OP said, just let me do my job without distraction.
That being said, however, I am loving lime at the moment–my yummy vodka gimlet with Rose’s Lime Juice is sublime. I may just have another!
I suspect the real answer has something to do with building teamwork. Remember, there is no “I” in “team”. 
If something like this came up at my office, I’d probably just say, truthfully at that, that I do not own any lime green clothes and had no intention of purchasing any “Just for FUN!”
No, but there is “meat.”
And there’s “meatpie,” and in “pie” there’s “I,” and… oh hell, I don’t know.
(Anyone else see Shaun of the Dead?)
Oh, sitting isn’t a problem. I can sit in a regular chair just fine, and if I need to get down on the reading rug with the kids, I sit on my knees.
Yeah, I hear that old turd every so often.
There may be no I in team, but there sure is a “u” in DUMBASS.
Re the OP:
Aw, it sounds like someone has a case of the Mondays!
The last time someone said that to me, I looked him in the eye and said, “And there’s no ‘blithering fuck-wit’ in ‘team’, either, yet here you are.” On further contemplation, I probably should have said, “and there’s no ‘we’ or ‘us’ in team, either. And in fact, there’s no ‘teamwork’ in ‘team’.” With a little thought, you can deflate this kind of jackassery real damn quick.
I get really, really irked when some half-wit, illegitimate offspring of a horse and a donkey decides to try and tell me there’s some kind of special importance about what letters are in words. Yeah, there’s no ‘i’ in ‘team’ - nor will you find the letters b, c, d, f, g, h, j, k, l, n, o, p, q, r, s, u, v, w, x, y or z.
Spelling == good; contrived crap == bad. End of debate.
No, but there is a “me”.
Or, with enough of them, they might start caring quite a bit that you wern’t wearing clothes. Which would at least enliven the day…(and possibly inspire a use for that lime sherbert).
I’ve never had to deal with this shite at work but I recall “Hat Day” in high school. I wore gloves.
I wish I could wear a costume when I wanted to. I’d show up at work in my RenFest costume and answer the phone using Ye Olde Renfaire Englishe. When I had my daily strategy meeting with my VP I’d ask him if, rather than making YET ANOTHER technical paper on “global emissions trading futures” he would be interested in funding the Lesbian Pirates of the South Seas for a trip to India to seek spices and jewels. I’d say “Yaaargh”, and then I would get to go home and take advantage of mental health leave. I’d take some classes at the junior college and work on that chef’s certificate. And open a nice little restaurant - a “true” English pub here in KC, not like the stupid ass “Fox and Hound” which is a TGI McScratchy’s in everything but name - or one of the “Irish pubs” in Westport that is nothing but a glorified gin house for college girls to get sloshed in and take turns barfing in the toilets while college boys bellow at sports players on projection TVs like a bull moose in rutting season screaming “Go Hawks! Go Chiefs! Go Phallocentric Least Common Denominator Sports!”
Or maybe I’ll just wear my hair differently.
I always like "No, but there’s an “eat” and a “me”.
At Lockheed, Fridays used to be Hawaiian shirt day. It was not required or anything. Nobody got badgered or hassled for not taking part. At Boeing, some people play dressup on Halloween. Again, you can choose not to take part. In both places, I didn’t. It was cool with everyone else. As for no “I” in team, there are plenty if “I’s” in blithering idiot 
Now birthdays are fun. The “victim” gets a redecorated cubicle, with black balloons, little coffins and a few ravens. It’s actually fun. Anyone who doesn’t want “the treatment” doesn’t get it.