I too do not often change unless I have to. The exception is this : after I’ve been in clothes all day at work, I frequently can’t wait to get them off. Part of this is having to wear a bra – I can’t tolerate them and after a day of having one on, I can’t get it off fast enough once I am home.
The issue with being cold is huge. I don’t know if I can say it is painful to be cold but it is something like that. I experience much discomfort when I am cold or even chilly and find it really difficult to function. So, yeah, changing during the cold months and especially taking a shower are really hard. I am also sensitive to being wet. It’s weird … I love being IN water and playing with water but I do not like being wet. There is a difference.
Cotton clothes …..YES! Terry cloth and jersey materials are the best, especially if they are heavy. I don’t really like bulk but heavy materials are heavenly. I even like cotton when it is rough. A rough wash cloth or towel feels really good!

Every change of clothing is like breaking in a new uncomfortable pair of jeans or shoes-on a daily basis.
It’s like a game of musical chairs where every time one finds a comfy warm spot, the music begins anew & one is forced to abandon one’s cozy perch all over again.
What I’m wearing becomes warm & cushy through (recent/current) use-so I’m reluctant to switch out of those items & into something else (chilly & stiff, comparatively).

I have designated outdoor & indoor clothing/ensembles: the stretchy loose shapeless things I wear at home & the “decent-looking” pretty clothing (tighter & more flattering, form-accentuating) I wear for being seen in public.

Bras are so uncomfortable that I only wear them for a couple hours when out in public & as soon as I get home I wriggle out of that constricting harness-along with the rest of the “outdoor outfit”.

Underwear & sox are exceptions, I don’t mind changing those regularly, as there is very little “acclimation period” involved in getting used to any particular pair.
I recall fights with my mother over wearing tights, which I hated-at least, as an adult, I have the choice to eschew pantyhose-they’d be unbearable.

I don’t bother with special sleepwear, I hated having to put on a nightgown when I was a kid-how is it easy to rest when one’s twisted up in a dress ? I just wear what I’ve had on all day (at home), sweatpants & well-worn, decades-old t-shirts.

Showering leaves my skin/flesh feeling raw, rubbery, and repulsive, exfoliated to the point of excavation (subjective perception, not objective fact-but how I feel is what’s real to me, regardless of “external reality”). Can’t reduce it to a shorter shower, because it takes half an hour to feel clean (and my hair is always falling out, so I spend an inordinate amount of time just salvaging that material from clogging the drain). Afterwards, it takes hours for me to recover & feel like I fit inside my own skin again. Hence, I procrastinate taking shower-though I don’t like being grimy either-the optimal “happy medium” point is between these extremes.

If my clothes are sweaty, then I’d rather change out of them due to the odor-yet on a tactile basis (sense of touch), they’re still comfy (so long as they aren’t damp). Being stuck wearing moist or soaked clothing makes me panic, such as if my shoes/socks get wet out in the rain.

The exception to that guideline is during hottest parts of summer, when damp clothing is a cooling relief that rapidly evaporates dry anyway. When it’s that hot, I don’t mind taking multiple brief showers day after day-but the weather here isn’t usually like that.

I avoid getting into & out of the shower-but while I’m immersed, I feel okay-it’s the phase/state/condition transitions that disturb & upset me so strongly. Same thing with swimming-I love it, but I become hysterical-due to the physical sensation of being wet (and in clothing, the swimsuit)-immediately upon leaving the water.

Temperature changes are quite unpleasant & aversive to contend with as well. It’s really off-putting when I’m going from outdoors to indoors, if there’s a significant disparity between those environments (be it air-conditioning in summer, or heat in winter). The more often I have to adjust to different surroundings, the more miserable/grouchy I am for it.

I don’t hate taking a shower, it’s the coldness when drying off I hate.

Weirdly I loved swimming as a kid, spending hours upon hours turning into a prune in the pool… but baths and showers, unh-uh.

Now it is easier (I’m 50+) to switch from day to bedtime clothes, but everything is loose and soft and mostly cotton… though I’ve found synthetic hunting camo to be quite comfortable, oddly enough; protects from wind and vents heat well, not giving me that clammy suffocating feeling. Fits loosely and full of lovely pockets… also wears like iron, so I’ve had the same camo pants for 3 years now and they aren’t even beginning to wear through the knees. So I haven’t had to go through the shopping and trying on of new clothes, or the break-in period. If anybody cares to try them, they’re Cabela’s microtek pants… I think they have overalls, too.

I have to stay pretty well covered up because the air moving over my skin bugs the dickens out of me.

My partner is not ASD, but probably has dyspraxia and her clothing sensitivities are more acute. So it is just our normal. =0)

I think there’s a whole world out there of people with asd traits but who are not officially asd. I think it’s a great pity that autism is so poorly understood in my country that many people still have the cheek to claim it doesn’t exist. In an ideal world wider society would recognise it as a very long spectrum, with many people carrying traits. That would lead to wider acknowledgement of social issues like shops that are too overwhelming to shop in, because the corporations would see this as something that bothers a lot of people, and not simply those that meet the classical DSMV criteria.