Autism

If you're looking for shirts, I only feel comfortable wearing ones with french cuffs and would recommend them highly.

Normal cuffs irritate me no end, they're tight , they move and jab against my skin constantly.

French cuffs with nice solid cufflinks are looser, soft-edged, and have a nice weight to them that stops them moving so much.

How about linen? This is a woman's shirt, $2 at the thrift, super comfy and smooth. LOL, the vest is also a woman's top, also $2.

It depends on how much better you want to dress. Some "Fishing Shirts" can be a big step up from a simple tee, while not being grossly uncomfortable.

Have you tried silk dress shirts?

I also hate wearing monkey suits due to sensory issues. But silk feels nice. Not quite as breathable, tho. But the roughness of more common fabrics for those kind of shirts is way more irritating than getting a bit hot inside the clothes.

i have to use layers. it can get hot in the summer outdoors but for work I'm mostly indoors and the layering would hide most sweat anyway.

for me, polyester "tech" fabric shirts as base layer can balance texture/touch sensory concerns and they usually slide freely against other fabrics so it wouldn't bunch or restrict movement.

I've seen some upper management wear tech fabric polo/golf shirts in the office as a single layer (i knew it was single later cuz i could see their nipples outline 🤮) maybe that is allowed in your workplace. i understand if you don't wasn't others to see your nipples though.

I tend to wear jersey knit, short sleeve polo shirts. They feel like wearing a t-shirt, give me plenty of room in the neck (I hate anything remotely tight around my neck or wrists), look normal tucked or untucked, fit in in most professional situations, and can be upgraded with a sport coat if I absolutely have to. I just have to be careful to find ones that don't have the ribbed (itchy) hems on the arms - I want a wide open arm hole. My go to brand just added them so I have to find something new.

I have never found a comfortable suit jacket or sport coat, I don't think they exist for me.

I don't have much advice for pants, I don't have many sensory issues as long as they're not binding. I usually wear wide-leg levis and keep a pair or two that are in nice enough condition for most business casual circumstances. Then I have a couple pair of slacks that I just had to find by trial and error for the other (rare) occasions.

I used to wear jeans only and I pretty much hated it. I now wear those mildly stretchy pants that normally go under suits. On top, I wear polo's when the setting is semi formal. I try to find the ones that are loosely fitting because I'm kinda self conscious about wearing stuff that's too short or tight.

Idk where you are located but for me, www.wefashion.nl has what I need. You could have a look, even if you're not in the Netherlands. Maybe you'll find a similar store in your area that also deals in large sizes like that. I'm close to 2m tall and I kind of have a beer belly but narrow shoulders so only XL really works for me.