Cremation for me, so…something that burns down easily. If I were having a full on casket viewing, I would wear my favorite Hello Kitty T shirt.
I was wondering the same thing as I was perusing this thread, so I Googled the question and also asked ChatGPT. The answer was the same: the body is generally clothed, usually in the garments that were being worn when delivered to the funeral home/crematorium. But if the family requests it, the deceased can be dressed in other clothes. This would be appropriate:
So my answer to the OP, even though I have requested cremation, would be a T-shirt of one of my favorite sports teams. My kids can decide which one. And comfy shorts, of course.
Just occured to me I wouldn’t mind wearing a Ramones shirt.
I disagree with this platitude. The funeral is for both the deceased and for the bereaved. I do care how I am commemorated and how my life and my identity are presented to the survivors at my funeral.
When I die there will probably be no family to to commemorate me, but I have friends that I am close to and my funeral will hopefully be themed around our common activities.
At some point, I would like to start a discussion about the morality of controlling one’s own funeral versus letting your heirs make the decisions, but no time at this moment yet.
My body is supposed to have it’s organs harvested and the rest used for medical purposes, but considering how I’ve treated it, it may well be like Seanbaby once opined:
He was pulverized so severely that when he got to the locker room, they confiscated [ParallelLine’s] organ donor card and told him he’d be lucky if future people could harvest him for soup.
So, if all my plans are upset and my body is displayed at an open casket, I’d like if they hired a professional clothing and styling consultant so that my dead body looked better than I ever had in life. I don’t expect to have a lot of people in attendance, but I want my younger brothers, sisters in law, and other family to see me looking great!
“Damn, I didn’t know his dieting and weight loss had gone so well. And he looks good when he dresses up, I would never had known, he’s always in jeans and a long sleeved T.”
The joke answer was going to be “Dressed in the neo-futuristic clothes that was my everyday dress in 2099”. Implying that I got to live a nice long time. 
Shouldn’t that be in on e of your least favorite teams if it’s going to burn up in the crematorium?
Sorta
I’ll see you in hell, Tony Romo!
I wouldn’t be caught dead wearing a Raiders t-shirt.
Oh, wait…
I suppose I can accept that it is a platitude, but it is an objective truth that the deceased will never know the outcome. My family and friends could tell me that a monument will be erected in my honor lauding my intelligence and charisma for all time, but if the exact opposite happens I will never know the difference.
From bottom to top: Beatle boots, skinny jeans, a Charlie Brown shirt, a Mexican wrestling mask, and a Carmen Miranda Tutti-Frutti hat.
I’m presently between post-life directives, so If I get killed soon anything might happen to my body.
Kinda immaterial what I’m wearing if my remains are cremated. Open caskets have no place in my cultural history, so probably nobody I know will ever see my remains. Just some bored undertaker techs. But …
I’m given to understand that male intact corpses are typically quite … tumescent. So I would prefer a nude burial. As they said back in the my formative 1960s:
Let it all hang out!
One last time. 
you know what …?
just take me up north and sit me next to the road …
(spoilered pic of a mummy in the Atacama Dessert)
.
I’ll sit there for the next 7000 years …
(Chinchorro mummy - Chile’s native version of Jamón Serrano)
I dunno, by the time my mother died, her naked body looked kinda sad. I mean, she’d been sick and all that. She looked much better with clothes on.
If my relatives and friends are going to be looking at my body after my after death, I’d prefer they see a version that isn’t too unpleasant to look at. So something from my wardrobe. Preferably, nothing so nice that a relative would like to inherit it. Probably something woven, rather than knit, as that’s generally less revealing. Jeans and some random cotton blouse, i guess, so the clothes burn cleanly when it’s all carted off to be cremated.
I have a cosplay costume from an old '90s anime series that I have never worn in public, but hope to be buried in. I’m sure it would cause quite a shock to my friends/family to see me that way. 
Given your username and my surmise that you are male, I hope the costume is not Sailor Moon. Yes, that’d set the cat amongst the pigeons in your family.
Right series but wrong character. (Knowledge of the Periodic Table could provide a clue!) But actually my kids would probably laugh… it would be the neighbors who would be WFT-ing when they saw me! 
My navy blue pinstripe suit, a pale blue shirt, and my navy blue tie.
Boring yes, but I hope that someone would tuck in a bottle of Oban 14 single-malt Scotch, and my favourite pipe and Peterson’s University Flake tobacco. Oh, and some matches, of course.
Surely a man as generous as your goodself would allow your pallbearers to strain it through their kidneys first? [d&r] 
I’ll go with naked but reasonably well washed.
But my actual plan will involve both naked and slimy, as I intend to donate my body to the investigative and tutorial University hospital just up the road from me. (Famous for the world first heart tansplant)
I have not done that much good in life, perhaps lending my corpse to a student with a scalpel will improve their lives.
I am also a full body organ donor, so I hope to die in a hospital where transplants can be made. That might ruin it for the students somewhat.
For all the people who plan to donate their body to science, have a backup plan. That’s what my mother wanted to do, but she died of covid, and no one wanted an infectious corpse. Not even for medical students to cut up.