Like is it a branded one?

My partner has one that was just like a kilt, stockings, and a shirt. She only wears it for.....reasons....at home, but it wouldn't look too out of place in public.

Probably

Does it matter?
Probably not

I think the motivations of the 26-year-old are immediately called into question in a way they wouldn't be for someone of high school age, so in that sense at the very least, yes, it's strange.

What are, or do you suppose are, the motivations of this 26-year-old? (And note that "because they want to" does not address the actual motivations.)

Depends. If people can guess your age more or less correctly, then, likely yes. Strange in the sense of weird.

If it's obvious that you are on your way to a costume party or some cosplay event, then, it's probably not considered too weird but it will still be considered unusual.

Unless you are Angus Young, yes.

Wat. Yes. WAT?

yeah.

it's a fetish/fashion subculture thing. that is strange by definition.

it's not normal for adults to wear school uniforms as they are not in school.

Yes

If it makes you self conscious enough to ask, do yourself a favor and ditch it.

They look nice. Wear what you want.

Do you mean dressing like a tart?

I would say so, yes.

Edit: Downvote if you want, but most people will think that is creepy and/or suspicious. Don't ask questions you don't want the answer to lol

Yes. Even a letterman jacket, you have until August of the year you graduated, then never again.